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Summary of Significant Accounting Policies (Details 5) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Dec. 31, 2014
Stock-based compensation costs          
Time period of historical volatility of stock used to estimate expected volatility     5 years 5 months 12 days    
Expected dividend yield assumption (as a percent)     0.00%    
Granted (in shares)     1,696,653    
Accrued salaries and wages $ 89,355   $ 89,355   $ 84,034
Stock based compensation expense 2,025 $ 2,915 $ 6,446 $ 8,012  
Weighted-average assumptions used in the Black-Scholes option-pricing model          
Risk-free interest rate (as a percent)     1.55% 1.68%  
Expected volatility (as a percent)     31.86% 44.80%  
Weighted-average expected life (years)     5 years 5 months 12 days 5 years 5 months 12 days  
Phantom Share Units (PSUs)          
Stock-based compensation costs          
Accrued salaries and wages 6,000   $ 6,000   8,200
Total compensation cost related to nonvested awards not yet recognized 20,500   $ 20,500    
Period for recognition of unrecognized compensation cost     1 year 10 months 24 days    
Stock based compensation expense 1,900 2,100 $ 11,400 $ 4,700  
Amounts paid on cash settled awards 7,600   $ 12,900 6,000  
Phantom Share Units (PSUs) | Minimum          
Stock-based compensation costs          
Vesting period     3 years    
Phantom Share Units (PSUs) | Maximum          
Stock-based compensation costs          
Vesting period     5 years    
Stock Appreciation Rights (SARs)          
Stock-based compensation costs          
Vesting period     4 years    
Accrued salaries and wages 7,700   $ 7,700   $ 6,300
Total compensation cost related to nonvested awards not yet recognized 6,600   $ 6,600    
Period for recognition of unrecognized compensation cost     2 years 8 months 23 days    
Stock based compensation expense 3,000 100 $ 4,100 200  
Amounts paid on cash settled awards $ 300 $ 400 $ 2,600 $ 1,600