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Consolidated Statements of Stockholders' Equity (Parenthetical) - USD ($)
$ in Thousands
12 Months Ended
Dec. 05, 2018
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Statement of Stockholders' Equity [Abstract]        
Shares repurchased (shares) 100,000      
Preferred shares converted into common stock (shares) 100,000      
Cash dividends declared and paid   $ 9,000    
Inducements paid $ 12,000 12,000    
Convertible preferred stock accretion of beneficial conversion feature $ 14,700 17,567 [1] $ 3,532 $ 3,244
Acquired value of beneficial conversion feature   $ 6,100    
[1] Represents total accretion of $17.6 million, net of $6.1 million acquired value of beneficial conversion feature attributable to repurchased Series A Convertible Preferred Stock.