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Consolidated Statements of Changes in Stockholders' Equity - USD ($)
$ in Thousands
Total
Common Stock [Member]
Additional Paid-In Capital [Member]
Accumulated Other Comprehensive Loss [Member]
Accumulated Deficit [Member]
Balance at Dec. 31, 2014 $ 184,285 $ 1,350 $ 209,216 $ (53) $ (26,228)
Balance, shares at Dec. 31, 2014   134,959,000      
Restricted stock issued, net   $ 9 (9)    
Restricted stock issued net, shares   861,000      
Shares repurchased (24,116) $ (12) (24,104)    
Shares repurchased, shares   (1,190,000)      
Exercise of stock options, net $ 4,520 $ 37 4,483    
Exercise of stock options net, shares 3,785,473 3,785,000      
Stock-based compensation $ 10,900   10,900    
Tax benefit from stock option exercised and vested restricted shares 57,474   57,474    
Other comprehensive income (loss) (73)     (73)  
Dividends (78,540)       (78,540)
Net income 80,052       80,052
Balance at Dec. 31, 2015 234,502 $ 1,384 257,960 (126) (24,716)
Balance, shares at Dec. 31, 2015   138,415,000      
Restricted stock issued, net   $ 16 (16)    
Restricted stock issued net, shares   1,662,000      
Shares repurchased (39,379) $ (37) (39,342)    
Shares repurchased, shares   (3,778,000)      
Exercise of stock options, net $ 195 $ 2 193    
Exercise of stock options net, shares 176,350 176,000      
Stock-based compensation $ 14,892   14,892    
Tax benefit from stock option exercised and vested restricted shares 8,557   8,557    
Other comprehensive income (loss) 82     82  
Dividends (43,660)   (17,505)   (26,155)
Net income 26,155       26,155
Balance at Dec. 31, 2016 $ 201,344 $ 1,365 224,739 (44) (24,716)
Balance, shares at Dec. 31, 2016 136,475,000 136,475,000      
Restricted stock issued, net   $ 10 (10)    
Restricted stock issued net, shares   1,022,000      
Shares repurchased $ (7,891) $ (7) (7,884)    
Shares repurchased, shares   (698,000)      
Exercise of stock options, net 532 $ 2 530    
Exercise of stock options net, shares   197,000      
Stock-based compensation 14,717   14,717    
Tax benefit from stock option exercised and vested restricted shares 492   492    
Other comprehensive income (loss) 335     335  
Dividends (43,777)   (16,578)   (27,199)
Net income 27,199       27,199
Balance at Dec. 31, 2017 $ 192,951 $ 1,370 $ 216,006 $ 291 $ (24,716)
Balance, shares at Dec. 31, 2017 136,996,000 136,996,000