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Stockholders' Equity - Narrative (Details) - USD ($)
 1 Months Ended 3 Months Ended 12 Months Ended
Mar. 31, 2019
Mar. 31, 2019
Mar. 31, 2018
Dec. 31, 2018
Conversion of Stock [Line Items]        
Common stock, outstanding (shares) 83,839,947 83,839,947   76,080,625
Preferred stock, authorized (shares) 16,670,000 16,670,000   16,670,000
Common stock dividend rate (usd per share) $ 2.13 $ 2.13    
Common stock, monthly dividend rate (usd per share)   $ 0.1775    
Agent | At-the-Market Program        
Conversion of Stock [Line Items]        
Number of shares issued (shares)   7,759,322,000    
Gross proceeds from sale of stock   $ 152,800,000    
Commissions paid   1,500,000    
Payments of stock offering costs   1,200,000    
Aggregate common stock offering price   $ 175,000,000    
Redeemable Preferred Stock        
Conversion of Stock [Line Items]        
Preferred stock, authorized (shares) 13,409,650 13,409,650   13,409,650
Preferred stock, issued (shares) 5,484,994 5,484,994   5,416,890
Dividend payout (usd per share)   $ 0.453125    
Preferred stock, dividend rate   7.25%   7.25%
Preferred stock, liquidation preference (usd per share) $ 25 $ 25   $ 25
Redeemable Preferred Stock | Maximum        
Conversion of Stock [Line Items]        
Periods for dividend payment   30 days    
Redeemable Preferred Stock | Minimum        
Conversion of Stock [Line Items]        
Periods for dividend payment   10 days    
Redeemable Preferred Stock | Agent | At-the-Market Program        
Conversion of Stock [Line Items]        
Number of shares issued (shares)   68,104 1,676  
Gross proceeds from sale of stock   $ 1,700,000    
Commissions paid   25,000 $ 623,000  
Payments of stock offering costs   $ 59,000 500,000.0  
Aggregate preferred stock offering price     200,000,000  
Sale of stock proceeds     $ 41,000