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Consolidated Statements of Stockholders' Equity - USD ($)
$ in Thousands
Total
Common Stock Shares [Member]
Treasury Stock-Common [Member]
Capital in Excess of Par Value [Member]
Retained Earnings [Member]
Non-Redeemable Preferred Stock [Member]
Balance at Dec. 31, 2015 $ 421,580 $ 2,713 $ (24,532) $ 192,249 $ 248,150 $ 3,000
Balance, shares at Dec. 31, 2015   27,132,000 (3,736,000)      
Net income (loss) 112,168       112,168  
Dividend accrued on redeemable preferred stock (27,761)       (27,761)  
Accretion of redeemable preferred stock (18,256)       (18,256)  
Stock-based compensation 4,979     4,979    
Exercise of stock options 371 $ 4   367    
Exercise of stock options, shares   45,000        
Exercise of warrants, net   $ 411 $ (411)      
Exercise of warrants, shares   4,104,000 (34,000)      
Restricted stock granted from treasury stock (484)   $ 4,855 (5,339)    
Restricted stock granted from treasury stock, shares     765,000      
Excess income tax detriment associated with stock-based compensation (84)     (84)    
Balance at Dec. 31, 2016 492,513 $ 3,128 $ (20,088) 192,172 314,301 3,000
Balance, shares at Dec. 31, 2016   31,281,000 (3,005,000)      
Cumulative effect of change in accounting principle 1,060       1,060  
Net income (loss) (29,217)       (29,217)  
Dividend accrued on redeemable preferred stock (23,443)       (23,443)  
Accretion of redeemable preferred stock (6,487)       (6,487)  
Stock-based compensation 5,099     5,099    
Restricted stock granted from treasury stock (1,361)   $ 1,814 (3,175)    
Restricted stock granted from treasury stock, shares     317,000      
Other 32   $ 172 (140)    
Other, Shares     26,000      
Balance at Dec. 31, 2017 438,196 $ 3,128 $ (18,102) 193,956 256,214 3,000
Balance, shares at Dec. 31, 2017   31,281,000 (2,662,000)      
Net income (loss) (72,226)       (72,226)  
Dividend accrued on redeemable preferred stock (26,840)       (26,840)  
Accretion of redeemable preferred stock (3,375)       (3,375)  
Stock-based compensation $ 8,358     8,358    
Exercise of stock options, shares 2,525          
Restricted stock granted from treasury stock $ (1,936)   $ 1,916 (3,852)    
Restricted stock granted from treasury stock, shares     224,000      
Other 20     20    
Other, Shares   2,000        
Balance at Dec. 31, 2018 $ 342,197 $ 3,128 $ (16,186) $ 198,482 $ 153,773 $ 3,000
Balance, shares at Dec. 31, 2018   31,283,000 (2,438,000)