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Stock-based Compensation - Narrative (Details) - USD ($)
3 Months Ended
Feb. 21, 2019
Mar. 31, 2019
Mar. 31, 2018
Stock-based Compensation arrangements      
Stock based compensation expense   $ 15,100,000 $ 5,400,000
Decrease to tax expense from stock-based compensation activities   $ 1,100,000  
Increase to tax expense from stock-based compensation activities     $ 200,000
Restricted Stock Units      
Stock-based Compensation arrangements      
Granted (in shares)   76,232  
Granted (in dollars per share)   $ 24.95  
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)   5.00%  
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)   526,730  
Granted (in dollars per share)   $ 24.95  
Number of years over which performance criteria is to be met   3 years  
Hybrid Performance Share Awards      
Stock-based Compensation arrangements      
Granted (in shares)   315,029  
Granted (in dollars per share)   $ 24.95  
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 (as a percent)   25.00%  
Hybrid Performance Share Awards | Hybrid performance share awards, percentage vesting on the second anniversary      
Stock-based Compensation arrangements      
Award vesting rights (as a percent)   25.00%  
Hybrid Performance Share Awards | Hybrid performance share awards, percentage vesting on the third anniversary      
Stock-based Compensation arrangements      
Award vesting rights (as a percent)   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)   536,673  
Granted (in dollars per share) $ 20.63    
Performance period   3 years  
TSR Performance Share Awards | Minimum      
Stock-based Compensation arrangements      
Granted (in dollars per share)   $ 11.95  
TSR Performance Share Awards | Maximum      
Stock-based Compensation arrangements      
Granted (in dollars per share)   $ 24.11