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Stockholders' Equity (Narrative) (Details) - USD ($)
$ / shares in Units, $ in Thousands
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Equity, Class of Treasury Stock [Line Items]      
Stock Repurchase Program Authorized Amount1 $ 70,000    
Treasury Stock, Value, Acquired, Cost Method 0    
Stock Repurchase Program Remaining Authorized Repurchase Amount1 $ 7,700    
Stock repurchase program remaining number of shares authorized to be repurchased 590,141    
SharePrice $ 13.1    
legal surplus $ 76,300 $ 70,400  
Preferred Stock [Member]      
Equity, Class of Treasury Stock [Line Items]      
Preferred Stock Issue Costs 13,600 13,600  
Common Stock [Member]      
Equity, Class of Treasury Stock [Line Items]      
Common Stock Issuance Cost $ 10,100 $ 10,100  
Seventy Millions Repurchase Program [Member]      
Equity, Class of Treasury Stock [Line Items]      
Total number of shares purchased   803,985 1,153,998
Treasury Stock Acquired, Average Cost Per Share   $ 11.1 $ 14.66
Treasury Stock, Value, Acquired, Cost Method   $ 8,900