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Stock-Based Compensation - Performance-Based Restricted Stock Units (Narrative) (Details)
$ in Millions
1 Months Ended 3 Months Ended 9 Months Ended 12 Months Ended
Mar. 31, 2017
Dec. 31, 2018
Sep. 30, 2018
employee
shares
Dec. 31, 2018
USD ($)
employee
shares
Dec. 31, 2017
USD ($)
shares
Dec. 31, 2016
USD ($)
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
PBU expense reversed | $       $ 5.1 $ 7.1 $ 5.1
PBUs            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Awards granted (shares)       299,028,000 333,800,000 1,350,750,000
Performance period   2 years        
PBUs that will become vested and payable at the threshold performance level (as a percent)   80.00%   15.00%    
Performance Shares            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
PBUs that will become vested and payable at the threshold performance level (as a percent)       150.00%    
PBU expense reversed | $           $ 5.4
Number of shares issued (shares)           483,623
2008 EIP | PBUs            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Vested PBUs to be paid in whole shares of common stock (as a percent) 100.00%     100.00%    
Shares that vest and become payable based on the cumulative revenue from continuing operations (as a percent) 65.00%     50.00%    
PBUs that vest and become payable on the cumulative adjusted EBITDA from continuing operations (as a percent) 35.00%     35.00%    
Performance period 2 years     2 years    
PBUs that will become vested and payable at the threshold performance level (as a percent) 35.00%          
PBUs that will become vested and payable at the target performance level (as a percent) 100.00%     100.00%    
Maximum PBUs that may become vested and payable (as a percent) 100.00%     150.00%    
PBUs that shall become vested and payable if performance does not equal or exceed the applicable threshold performance level (as a percent) 0.00%     0.00%    
Executive officers | PBUs            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Number of employees granted share-based compensation awards | employee     1      
Executive officers | 2017 EICP | PBUs            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Number of employees granted share-based compensation awards | employee       5    
Senior leaders | PBUs            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Number of employees granted share-based compensation awards | employee     2      
Awards granted (shares)         333,800 1,350,750
Senior leaders | 2017 EICP | PBUs            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Number of employees granted share-based compensation awards | employee     1 9    
Awards granted (shares)     12,000 54,180    
Executive officers and senior leaders | 2017 EICP | PBUs            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Awards granted (shares)     40,750 192,098