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Stock Based Compensation - Additional Information (Details) - USD ($)
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
May 12, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Stock-based compensation, capitalized amount $ 0 $ 0 $ 0  
Restricted Stock Units        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Granted 61,000      
Vesting period 3 years      
Unrecognized compensation cost $ 6,000,000      
Weighted-average period (in Years) 1 year 6 months      
Total fair value of shares vested $ 16,000,000 14,000,000 12,000,000  
Expected term 3 years      
Accrued dividend equivalents   $ 1,000,000 $ 1,000,000  
Restricted Stock Units | Maximum        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Accrued dividend equivalents $ 1,000,000      
Restricted Stock Units With Performance Restrictions        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Granted 186,000      
2007 Omnibus Equity Compensation Plan        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Total shares authorized for grant (in Shares) 15,500,000      
Shares available for grant (in Shares) 7,700,000      
2007 Omnibus Equity Compensation Plan | Stock Options        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Granted 0      
Vesting period 3 years 3 years 3 years  
Maximum terms 7 years      
Unrecognized compensation cost $ 1,000,000      
Weighted-average period (in Years) 1 year      
Total fair value of shares vested $ 2,000,000 $ 1,000,000 $ 3,000,000  
2007 Omnibus Equity Compensation Plan | Stock Options | Minimum        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Vesting period 1 year      
2007 Omnibus Equity Compensation Plan | Stock Options | Maximum        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Vesting period 3 years      
2007 Omnibus Equity Compensation Plan | Restricted Stock Units | Minimum        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Vesting period 1 year      
2007 Omnibus Equity Compensation Plan | Restricted Stock Units | Maximum        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Vesting period 3 years      
2017 Omnibus Equity Compensation Plan        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Total shares authorized for grant (in Shares)       7,200,000.0
Shares available for grant (in Shares) 7,200,000      
Employee Stock Purchase Plan        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Shares available for grant (in Shares) 2,000,000      
Lesser of fair market value 90.00%      
Shares issued (in shares) 93,000 93,000 98,000