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Equity-Based Compensation (Details) (USD $)
In Thousands, except Share data, unless otherwise specified
 3 Months Ended 9 Months Ended 3 Months Ended 9 Months Ended 0 Months Ended 3 Months Ended 9 Months Ended 3 Months Ended 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Stock Option
Sep. 30, 2013
Stock Option
Sep. 30, 2014
Stock Option
Sep. 30, 2013
Stock Option
Dec. 31, 2013
Stock Option
Apr. 24, 2014
Stock Option
Chief Executive Officer
Apr. 24, 2014
Stock Option
Chief Executive Officer
Sep. 30, 2013
Stock Option
Minimum
Sep. 30, 2014
Stock Option
Minimum
Sep. 30, 2013
Stock Option
Minimum
Sep. 30, 2013
Stock Option
Maximum
Sep. 30, 2014
Stock Option
Maximum
Sep. 30, 2013
Stock Option
Maximum
Sep. 30, 2014
Stock Option
2012 Plan
Plan Options                                    
Options/Units outstanding at the beginning of the period (in shares)             1,861,761                      
Options/Units granted (in shares)         0   542,750     500,000                
Options/Units exercised (in shares)             (338,549)                      
Options/Units cancelled or forfeited (in shares)             (108,204)                      
Options outstanding at the end of the period (in shares)         1,957,758   1,957,758                      
Vested and exercisable at the end of the period (in shares)         632,994   632,994                      
Weighted Average Exercise Price                                    
Options outstanding at the beginning of the period (in dollars per unit)             $ 26.09                      
Options granted (in dollars per share)             $ 74.52     $ 80.94                
Options exercised (in dollars per share)             $ 19.72                      
Options cancelled or forfeited (in dollars per share)             $ 44.57                      
Options outstanding at the end of the period (in dollars per unit)         $ 39.62   $ 39.62                      
Vested and exercisable at the end of the period (in dollars per share)         $ 20.56   $ 20.56                      
Consideration period for awards granted                   90 days                
Closing price of the common stock equals or exceeds for 90 consecutive calendar days                   $ 161.88                
Service period for amortization of awards                   6 years                
Total fair value of the grant                     $ 21,630              
Reversal of charge upon the completion of service period                   0                
Intrinsic values                                    
Intrinsic value of total stock options and notional units outstanding         62,200   62,200   107,100                  
Intrinsic value of total stock options vested and exercisable         32,200   32,200   38,900                  
Weighted average assumptions used in fair value calculation                                    
Expected term           6 years 3 months 18 days   6 years 3 months 18 days         6 years 3 months 18 days     10 years    
Volatility (as a percent)           49.00% 49.00% 49.00%                    
Risk-free interest rate (as a percent)                       1.00% 2.10% 1.00% 1.50% 2.80% 1.50%  
Dividend yield         0.00% 0.00% 0.00% 0.00%                    
Additional disclosures                                    
Non-cash stock-based compensation expense, net of estimated forfeitures 6,334 1,852 15,728 4,422 2,197 1,425 5,925 3,169                    
Total unrecognized compensation charge related non-vested options                                   $ 31,700