Quarterly report pursuant to Section 13 or 15(d)

Long-term Debt (Details)

v2.4.0.8
Long-term Debt (Details) (USD $)
9 Months Ended 9 Months Ended 1 Months Ended 9 Months Ended 1 Months Ended 9 Months Ended 0 Months Ended 9 Months Ended 3 Months Ended 9 Months Ended 0 Months Ended
Sep. 30, 2013
Dec. 31, 2012
Sep. 30, 2013
Bank credit facility
Dec. 31, 2012
Bank credit facility
Sep. 30, 2013
Bank credit facility
Subsequent event
Sep. 30, 2013
Bank credit facility
Minimum
Sep. 30, 2013
Bank credit facility
Maximum
Sep. 30, 2013
9.375% senior notes due 2017
Dec. 31, 2012
9.375% senior notes due 2017
Jan. 31, 2010
9.375% senior notes due 2017
Antero Finance
Nov. 30, 2009
9.375% senior notes due 2017
Antero Finance
Sep. 30, 2013
9.375% senior notes due 2017
Antero Finance
Nov. 17, 2009
9.375% senior notes due 2017
Antero Finance
Sep. 30, 2013
9.375% senior notes due 2017
Antero Finance
On or after December 1, 2013
Sep. 30, 2013
9.375% senior notes due 2017
Antero Finance
On or after December 1, 2015
Sep. 30, 2013
9.375% senior notes due 2017
Antero Finance
Prior to December 1, 2013
Sep. 30, 2013
7.25% senior notes due 2019
Dec. 31, 2012
7.25% senior notes due 2019
Aug. 31, 2011
7.25% senior notes due 2019
Antero Finance
Sep. 30, 2013
7.25% senior notes due 2019
Antero Finance
Sep. 30, 2013
7.25% senior notes due 2019
Antero Finance
On or after August 1, 2014
Sep. 30, 2013
7.25% senior notes due 2019
Antero Finance
On or after August 1, 2017
Sep. 30, 2013
7.25% senior notes due 2019
Antero Finance
On or before August 1, 2014
Sep. 30, 2013
7.25% senior notes due 2019
Maximum
Antero Finance
On or before August 1, 2014
Sep. 30, 2013
6.00% senior notes due 2020
Dec. 31, 2012
6.00% senior notes due 2020
Feb. 04, 2013
6.00% senior notes due 2020
Antero Finance
Nov. 19, 2012
6.00% senior notes due 2020
Antero Finance
Sep. 30, 2013
6.00% senior notes due 2020
Antero Finance
Sep. 30, 2013
6.00% senior notes due 2020
Antero Finance
On or after December 1, 2015
Sep. 30, 2013
6.00% senior notes due 2020
Antero Finance
On or after December 1, 2018
Sep. 30, 2013
6.00% senior notes due 2020
Antero Finance
On or before December 1, 2015
Sep. 30, 2013
6.00% senior notes due 2020
Antero Finance
Prior to December 1, 2015
Sep. 30, 2013
6.00% senior notes due 2020
Antero Finance
Prior to January 1, 2014
Sep. 30, 2013
6.00% senior notes due 2020
Maximum
Antero Finance
On or before December 1, 2015
Dec. 31, 2010
9.00% senior note
Sep. 30, 2013
9.00% senior note
Dec. 31, 2012
9.00% senior note
Sep. 30, 2013
Net premium
Dec. 31, 2012
Net premium
Sep. 30, 2013
Stand-alone revolving note
Dec. 31, 2012
Stand-alone revolving note
Sep. 30, 2013
5.375% senior notes due 2021
Nov. 05, 2013
5.375% senior notes due 2021
Antero Finance
Subsequent event
Long- term Debt                                                                                        
Long-term debt $ 2,995,455,000 $ 1,469,058,000 $ 1,512,500,000 $ 217,000,000       $ 525,000,000 $ 525,000,000               $ 400,000,000 $ 400,000,000             $ 525,000,000 $ 300,000,000                     $ 25,000,000 $ 25,000,000 $ 7,955,000 $ 2,058,000        
Less amounts due within one year 25,000,000 25,000,000                                                                                    
Long-term debt 2,970,455,000 1,444,058,000                                                                                    
Interest rate (as a percent)               9.375% 9.375%     9.375%         7.25% 7.25%   7.25%         6.00% 6.00%     6.00%               9.00% 9.00%         5.375% 5.375%
Maximum amount of the Credit Facility     2,500,000,000                                                                           25,000,000      
Current borrowing base     2,000,000,000                                                                                  
Lender commitments     1,750,000,000   1,500,000,000                                                                              
Outstanding balance     1,500,000,000 217,000,000                                                                         0 0    
Weighted average interest rate (as a percent)     2.30% 1.91%                                                                                
Outstanding letters of credit     32,000,000 43,000,000                                                                                
Commitment fees on the unused portion (as a percent)           0.375% 0.50%                                                                          
Senior notes issued                   150,000,000 375,000,000               400,000,000               225,000,000 300,000,000                               1,000,000,000
Issue price as percentage of par value                                                     103.00%                                  
Discount on long-term debt                         2,600,000                                                              
Premium on long-term debt                   6,000,000                                                                    
Redemption price of the debt instrument in the event of change of control (as a percent)                           104.688% 100.00% 100.00%         105.438% 100.00% 100.00%             104.50% 100.00% 100.00%   110.00%                    
Percentage of the principal amount of the debt instrument which the entity may redeem with the proceeds from certain equity offerings                                               35.00%                     35.00%                  
Redemption price of the debt instrument if redeemed with the proceeds of certain equity offerings (as a percent)                                             107.25%                 106.00%                        
Percentage of principal amount at which notes may be required to be repurchased in event of change of control                                       101.00%                         101.00%                      
Description of variable rate basis     LIBOR or lender's prime rate                                                                           lender's prime rate      
Unsecured notes payable assumed in the business acquisition                                                                       $ 25,000,000                
Basis spread on variable rate (as a percent)                                                                                 1.00%      
Percentage of the principal amount of the debt instrument which the entity may redeem with the proceeds from initial public offering                                       35.00%