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Common Stock and Share-Based Compensation - Narrative (Details) - USD ($)
1 Months Ended 3 Months Ended 9 Months Ended
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Sep. 30, 2018
Sep. 30, 2018
Sep. 30, 2017
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 1,000,000    
Common stock, shares authorized (shares) 250,000,000           250,000,000 250,000,000    
Common stock, par value (USD per share) $ 0.01           $ 0.01 $ 0.01   $ 0.01
Dividends paid (USD per share) $ 0.09 $ 0.09 $ 0.09 $ 0.09 $ 0.09 $ 0.09        
Payments of dividends               $ 24,663,000 $ 24,540,000  
Quarterly dividends expected (USD per share)               $ 0.03    
Unrecognized stock option expense related to unvested awards $ 0           $ 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 2,380,000,000.00    
Repurchase of common stock (shares)             0      
Remaining authorized amount for common share repurchase $ 197,100,000           $ 197,100,000 $ 197,100,000