Quarterly report pursuant to Section 13 or 15(d)

Stock-Based Compensation (Details 2)

v2.4.0.8
Stock-Based Compensation (Details 2) (USD $)
3 Months Ended 0 Months Ended
Mar. 31, 2014
Mar. 31, 2014
Restricted stock awards
Apr. 01, 2014
Restricted stock units
Subsequent event
Apr. 01, 2014
Restricted stock units
Subsequent event
Minimum
Apr. 01, 2014
Restricted stock units
Subsequent event
Maximum
Number of shares          
Total granted and unvested at the beginning of the period (in shares)   45,093      
Granted (in shares)   13,795 1,902,889    
Forfeited (in shares)   (2,050)      
Total awarded and unvested at the end of the period (in shares)   56,838      
Weighted average grant date fair value          
Total granted and unvested at the beginning of the period (in dollars per share)   $ 54.27      
Granted (in dollars per share)   $ 56.82      
Forfeited (in dollars per share)   $ 55.63      
Total awarded and unvested at the end of the period (in dollars per share)   $ 54.27      
Aggregate intrinsic value          
Total awarded and unvested at the beginning of the period   $ 2,861,000      
Granted   863,000      
Forfeited   (128,000)      
Total awarded and unvested at the end of the period   3,558,000      
Weighted average grant date fair value     123,800,000    
Unrecognized stock-based compensation expense $ 2,300,000        
Weighted average period for recognizing unrecognized stock-based compensation expense 3 years     3 years 6 months 4 years