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Stockholders' Equity (Narrative) (Details) - USD ($)
 3 Months Ended 12 Months Ended
Oct. 22, 2018
Mar. 31, 2019
Dec. 31, 2018
Equity, Class of Treasury Stock [Line Items]      
Preferred stock   $ 92,000,000 $ 92,000,000
Common stock   59,885,000 59,885,000
Legal surplus   92,600,000 90,200,000
Stock Repurchase Program Remaining Authorized Repurchase Amount   $ 7,700,000  
Stock repurchase program remaining number of shares authorized to be repurchased   390,644  
Stock Repurchase Program Authorized Amount   $ 70,000,000  
Share price   $ 19.79  
Preferred Stock [Member]      
Equity, Class of Treasury Stock [Line Items]      
Preferred Stock Issue Costs   $ 10,100,000 10,100,000
Common Stock [Member]      
Equity, Class of Treasury Stock [Line Items]      
Common Stock Issuance Cost   13,600,000 13,600,000
Series C Convertible Preferred Stock      
Equity, Class of Treasury Stock [Line Items]      
Conversion of convertable securities, conversion rate ratio 8642.25%    
Preferred stock, shares issued 84,000    
Preferred stock   92,000,000 92,000,000
Common stock   $ 59,900,000 $ 59,900,000