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Common Stock and Share-Based Compensation - Narrative (Details) - USD ($)
1 Months Ended 3 Months Ended 6 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Jun. 30, 2018
Jun. 30, 2018
Dec. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Preferred stock, shares authorized (shares)     1,000,000 1,000,000  
Common stock, shares authorized (shares)     250,000,000 250,000,000  
Common stock, par value (USD per share)     $ 0.01 $ 0.01 $ 0.01
Dividends paid (USD per share) $ 0.09 $ 0.09      
Quarterly dividends expected (USD per share)       0.09  
Annual dividends expected (USD per share)       $ 0.36  
Unrecognized stock option expense related to unvested awards     $ 0 $ 0  
Common Stock          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Authorized amount for common share repurchase threshold     $ 2,380,000,000.00 2,380,000,000.00  
Repurchase of common stock (shares)     0    
Remaining authorized amount for common share repurchase     $ 197,100,000 $ 197,100,000