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Stock-based Compensation - Narrative (Details) - USD ($)
3 Months Ended 9 Months Ended
Feb. 17, 2016
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Stock-based Compensation arrangements          
Stock based compensation expense   $ 5,100,000 $ (2,900,000) $ 23,000,000 $ 11,600,000
Tax deficiency on share-based compensation       $ 2,100,000  
Tax benefits realized for stock-based compensation         $ 0
Restricted Stock Units          
Stock-based Compensation arrangements          
Granted (in shares)       67,000  
Granted (in dollars per share)       $ 20.55  
Performance Share Awards | Minimum          
Stock-based Compensation arrangements          
Annual forfeiture rate assumption (as a percent)       0.00%  
Performance Share Awards | Maximum          
Stock-based Compensation arrangements          
Annual forfeiture rate assumption (as a percent)       6.00%  
Performance Share Awards Based on Internal Performance Metrics          
Stock-based Compensation arrangements          
Right to receive additional shares, maximum (as a percent)       100.00%  
Employee Performance Share Awards          
Stock-based Compensation arrangements          
Granted (in shares)       435,990  
Granted (in dollars per share)       $ 20.49  
Number of years over which performance criteria is to be met       3 years  
Hybrid Performance Share Awards          
Stock-based Compensation arrangements          
Granted (in shares)       271,938  
Granted (in dollars per share)       $ 20.49  
Minimum operating cash flow for the year preceding the performance period       $ 100,000,000  
Hybrid Performance Share Awards | Hybrid performance share awards, percentage vesting on the first anniversary          
Stock-based Compensation arrangements          
Award vesting rights, percentage   25.00%      
Hybrid Performance Share Awards | Hybrid performance share awards, percentage vesting on the second anniversary          
Stock-based Compensation arrangements          
Award vesting rights, percentage   25.00%      
Hybrid Performance Share Awards | Hybrid performance share awards, percentage vesting on the third anniversary          
Stock-based Compensation arrangements          
Award vesting rights, percentage   50.00%      
Performance Shares Based on Market Conditions          
Stock-based Compensation arrangements          
Right to receive shares (as a percent)       100.00%  
Right to receive an additional award in cash (as a percent)       100.00%  
TSR Performance Share Awards          
Stock-based Compensation arrangements          
Granted (in shares)       407,907  
Granted (in dollars per share) $ 18.57        
Performance period       3 years  
TSR Performance Share Awards | Minimum          
Stock-based Compensation arrangements          
Granted (in dollars per share)       $ 5.26  
TSR Performance Share Awards | Maximum          
Stock-based Compensation arrangements          
Granted (in dollars per share)       $ 9.14