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Consolidated Statements of Stockholders' Equity - USD ($)
shares 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, 2014 $ 434,048,000 $ 2,697,000 $ (28,374,000) $ 170,537,000 $ 286,188,000 $ 3,000,000
Balance, shares at Dec. 31, 2014   26,968 (4,320)      
Net income (loss) (34,765,000)       (34,765,000)  
Dividends paid on convertible preferred stocks (300,000)       (300,000)  
Dividend accrued on redeemable preferred stock (2,287,000)       (2,287,000)  
Accretion of redeemable preferred stock (686,000)       (686,000)  
Stock-based compensation 2,346,000     2,346,000    
Exercise of stock options 1,785,000 $ 16,000   1,769,000    
Exercise of stock options, shares   160        
Common stock issued for services 156,000     156,000    
Common stock issued for services, shares   4        
Restricted stock granted from treasury stock     $ 3,842,000 (3,842,000)    
Restricted stock granted from treasury stock, shares     584      
Common stock warrants issued 22,300,000     22,300,000    
Common stock warrants issuance costs (1,613,000)     (1,613,000)    
Excess income tax benefit associated with stock-based compensation 596,000     596,000    
Balance at Dec. 31, 2015 421,580,000 $ 2,713,000 $ (24,532,000) 192,249,000 248,150,000 3,000,000
Balance, shares at Dec. 31, 2015   27,132 (3,736)      
Net income (loss) 112,168,000       112,168,000  
Dividends paid on convertible preferred stocks (300,000)          
Dividend accrued on redeemable preferred stock (27,761,000)       (27,761,000)  
Accretion of redeemable preferred stock (18,256,000)       (18,256,000)  
Stock-based compensation 4,979,000     4,979,000    
Exercise of stock options 371,000 $ 4,000   367,000    
Exercise of stock options, shares   45        
Exercise of warrants, net   $ 411,000 $ (411,000)      
Exercise of warrants, shares   4,104 (34)      
Restricted stock granted from treasury stock (484,000)   $ 4,855,000 (5,339,000)    
Restricted stock granted from treasury stock, shares     765      
Excess income tax benefit associated with stock-based compensation 0          
Excess income tax detriment associated with stock-based compensation (84,000)     (84,000)    
Balance at Dec. 31, 2016 492,513,000 $ 3,128,000 $ (20,088,000) 192,172,000 314,301,000 3,000,000
Balance, shares at Dec. 31, 2016   31,281 (3,005)      
Cumulative effect of change in accounting principle 1,060,000       1,060,000  
Net income (loss) (29,217,000)       (29,217,000)  
Dividends paid on convertible preferred stocks (300,000)          
Dividend accrued on redeemable preferred stock (23,443,000)       (23,443,000)  
Accretion of redeemable preferred stock (6,487,000)       (6,487,000)  
Stock-based compensation 5,099,000     5,099,000    
Restricted stock granted from treasury stock (1,361,000)   $ 1,814,000 (3,175,000)    
Restricted stock granted from treasury stock, shares     317      
Other 32,000   $ 172,000 (140,000)    
Other, Shares     26      
Balance at Dec. 31, 2017 $ 438,196,000 $ 3,128,000 $ (18,102,000) $ 193,956,000 $ 256,214,000 $ 3,000,000
Balance, shares at Dec. 31, 2017   31,281 (2,662)