Annual report pursuant to Section 13 and 15(d)

Shareholders' Equity (Repurchase Program and Warrants) (Details)

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Shareholders' Equity (Repurchase Program and Warrants) (Details) - USD ($)
$ in Thousands
 12 Months Ended 142 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2018
Nov. 30, 2016
Class of Stock [Line Items]          
Repurchase and retirement of common stock $ 139,835 $ 5,293 $ 14,749    
Shares repurchased, value $ 3,000 $ 850      
Warrants outstanding (in shares) 0     0  
Warrant exercise (in shares)   2,000,000 13,236,333    
Intrinsic value of warrant exercised $ 1,830   $ 9,320    
Exercise of stock options, shares tendered in payment of exercise price (in shares) 19,294 19,658 846,789    
Common Stock          
Class of Stock [Line Items]          
Repurchase and retirement of common stock (in shares) 57,475,374 2,088,460 6,132,124    
Repurchase and retirement of common stock $ 6        
Exercise of warrants (in shares)   2,000,000 12,389,544    
Repurchase Program          
Class of Stock [Line Items]          
Shares authorized for repurchase (in shares)         27,500,000
Repurchase and retirement of common stock (in shares) 5,833,890 1,850,215   25,184,105  
Repurchase and retirement of common stock       $ 66,116  
Shares repurchased, value $ 16,705 $ 4,721      
Shares availabe for purchase under repurchase program (in shares) 2,315,895     2,315,895