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Share-Based Compensation (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Dec. 31, 2014
Share-based compensation disclosures          
Share Based Compensation expense $ 16,400 $ 8,600 $ 30,100 $ 19,300  
Liability related to awards 140,376   $ 140,376   $ 177,707
Restricted Stock Award | Employees and Director          
Share-based compensation disclosures          
Shares awarded during period     2,535,503 1,143,002  
Aggregate value of restricted stock awards at date of grant 34,700 $ 26,100 $ 34,700 $ 26,100  
Fair value awards vested     $ 13,200 $ 18,300  
Restricted Stock Award | Maximum | Employees and Director          
Share-based compensation disclosures          
Vesting period of shares     4 years    
Restricted Stock Based on Performance Conditions          
Share-based compensation disclosures          
Fair value awards vested     $ 3,700    
Restricted Stock Based on Performance Conditions | Executives          
Share-based compensation disclosures          
Shares awarded during period     438,307 362,311  
Vesting period of shares     3 years    
Liability related to awards $ 1,100   $ 1,100    
Restricted Stock Based on Market Conditions          
Assumptions used to value grant date fair value          
Risk free interest rate (as a percent 1.18% 0.80%      
Expected volatility (as a percent) 50.00% 40.00%      
Closing stock price at grant date (in dollars per share) $ 12.98 $ 18.19 $ 12.98 $ 18.19  
Expected term (in years) 3 years 2 years 11 months 19 days      
Restricted Stock Based on Market Conditions | Executives          
Share-based compensation disclosures          
Shares awarded during period     544,925 395,550  
Vesting period of shares     3 years    
Aggregate value of restricted stock awards at date of grant $ 4,700 $ 4,500 $ 4,700 $ 4,500  
Stock options | Employees and Director          
Share-based compensation disclosures          
Total intrinsic value of stock options exercised     800 46,900  
Total fair value of option vested during the period     $ 1,600 $ 1,500