Quarterly report pursuant to Section 13 or 15(d)

Summary of Significant Accounting Policies (Details 3)

v2.4.1.9
Summary of Significant Accounting Policies (Details 3)
3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Earnings per share    
Dilutive shares attributable to non-vested restricted stock and restricted stock unit awards and stock options. 5,286us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements  
Weighted Average Number of Shares Outstanding, Basic 265,294,794us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 262,049,659us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Weighted Average Number of Shares Outstanding, Diluted 265,300,080us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 262,049,659us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding
Restricted Stock and Restricted Stock Unit    
Earnings per share    
Non-vested shares 1,970,774us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount
/ us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis
= ar_RestrictedStockAndRestrictedStockUnitMember
 
Stock options    
Earnings per share    
Non-vested shares 81,021us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount
/ us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis
= us-gaap_EmployeeStockOptionMember