Annual report pursuant to Section 13 and 15(d)

Stockholders' Equity (Details)

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Stockholders' Equity (Details) - USD ($)
 12 Months Ended
Jun. 18, 2019
May 30, 2018
Dec. 19, 2016
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Dec. 20, 2019
Class of Stock [Line Items]              
Preferred stock dividend       $ 3,997,000 $ 7,295,000 $ 7,295,000  
Issuance of common stock       0 $ 287,988,000 $ 0  
Common Stock              
Class of Stock [Line Items]              
Authorized amount       $ 525,000,000     $ 300,000,000
Shares of common stock issued in public offering (in shares)   25,300,000 40,000,000.0        
Issuance of common stock   $ 288,000,000.0 $ 634,900,000        
Series A Preferred Stock              
Class of Stock [Line Items]              
Preferred stock cumulative cash dividends rate       10.00%      
Preferred stock, liquidation preference (in dollars per share) $ 50.00     $ 50.00 $ 50.00    
Preferred stock, dividend rate (in dollars per share)       $ 5.00      
Accrued and unpaid dividends (in dollars per share) 0.24            
Redemption price (in dollars per share) $ 50.24            
Redemption amount $ 73,000,000.0            
Loss on redemption 8,300,000            
Redemption date carrying value $ 64,700,000