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Equity and Capital (Details) - USD ($)
3 Months Ended 9 Months Ended
Sep. 30, 2020
Mar. 31, 2020
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Sep. 30, 2020
Sep. 30, 2019
Jan. 31, 2020
Dec. 31, 2019
Schedule of Shareholders' Equity [Line Items]                  
Compensation cost           $ 100,000 $ 100,000    
Available repurchase amount $ 375,000,000.0         375,000,000.0      
Dividends, per common share (in dollars per share) $ 0 $ 0.285 $ 0.28 $ 0.28 $ 0.28        
Accounts Payable and Accrued Liabilities                  
Schedule of Shareholders' Equity [Line Items]                  
Dividends payable $ 1,800,000         $ 1,800,000     $ 87,200,000
Common Stock                  
Schedule of Shareholders' Equity [Line Items]                  
At-the-market equity offering program               $ 400,000,000.0  
At-the-market equity offering program, period           3 years      
At-the-market equity offering program, shares issued (in shares) 0         0      
At-the-market equity offering program, stock available for future issuance           $ 400,000,000.0      
Share repurchase program, number of shares authorized (in shares) 1,700,000   800,000     1,700,000 800,000    
Share repurchase program, average cost per share           $ 15.14 $ 17.43    
Share repurchase program, value           $ 25,000,000.0 $ 14,600,000    
Stock repurchased during period (in shares)   1,650,000   175,000 660,000        
Common Stock | RSUs                  
Schedule of Shareholders' Equity [Line Items]                  
Stock repurchased during period (in shares)           200,000 100,000    
Common Stock | Maximum                  
Schedule of Shareholders' Equity [Line Items]                  
Share repurchase program, authorized amount               $ 400,000,000.0