Quarterly report pursuant to Section 13 or 15(d)

Share-Based Compensation and Cash-Based Incentive Compensation - Additional Information (Details)

v3.7.0.1
Share-Based Compensation and Cash-Based Incentive Compensation - Additional Information (Details) - USD ($)
6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2015
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]      
Common stock available for award under plans 14,633,337    
Restricted Stock Units (RSUs)      
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]      
Shares granted, grant date fair value $ 5,800,000    
Unrecognized share-based compensation expense $ 9,700,000    
Recognition period for unrecognized compensation expense 2019-11    
Restricted Shares      
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]      
Shares granted, grant date fair value $ 300,000    
Unrecognized share-based compensation expense $ 500,000    
Recognition period for unrecognized compensation expense 2019-04    
Cash-Based Incentive Awards | Minimum      
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]      
Adjusted EBITDA less interest expense $ 200,000,000 $ 300,000,000 $ 300,000,000
2010 Restated Incentive Compensation Plan      
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]      
Amendment increased the number of shares available in the Plan 7,700,000    
Directors Compensation Plan      
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]      
Common stock available for award under plans 170,524