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Equity - Initial Public Offering of Common Stock (Narrative) (Details) - USD ($)
$ / shares in Units, $ in Thousands
1 Months Ended 2 Months Ended 10 Months Ended 12 Months Ended
Jul. 26, 2018
Jul. 17, 2018
Jul. 31, 2018
Jun. 30, 2018
Feb. 28, 2017
Dec. 31, 2017
Dec. 31, 2019
Dec. 31, 2018
Subsidiary, Sale of Stock [Line Items]                
Net proceeds from IPO         $ 0 $ 0 $ 0 $ 133,805
Preferred dividend paid (in dollars per share)       $ 0.15        
Conversion of Series A to Common Shares                
Subsidiary, Sale of Stock [Line Items]                
Number of shares converted (in shares) 37,700,000   37,700,000          
Common shares issued on conversion (in shares) 39,600,000   39,600,000          
Right to receive cash payment per share (in dollars per share) $ 1.75              
Right to receive cash payment less paid dividends per share (in dollars per share) $ 1.60              
Cash payment for conversion of preferred shares $ 60,000              
Common Stock | Conversion of Series A to Common Shares                
Subsidiary, Sale of Stock [Line Items]                
Number of shares converted per each share of preferred stock (in shares) 1.05              
Series A Preferred Stock Conversion and Common Stock Offering                
Subsidiary, Sale of Stock [Line Items]                
Net proceeds from IPO $ 110,000              
Increase in common stock outstanding (in shares) 8,695,653 8,695,653            
Sale of stock, price per share (in dollars per share) $ 14.00              
Cash payment for conversion of preferred shares $ 60,000              
Sale of stock, consideration received $ 27,000   $ 27,000          
Reduction in income available to common stockholders               $ 87,000
Over-allotment option                
Subsidiary, Sale of Stock [Line Items]                
Sale of stock, price per share (in dollars per share) $ 14.00              
Sale of stock, underwriter option to purchase additional shares (in shares) 1,900,000   1,900,000