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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, 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 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      
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 209,419 197,000      
Stock-based compensation $ 14,717   14,717    
Tax benefit from stock option exercised and vested restricted shares 492   492    
Other comprehensive income 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      
Common stock issued $ 137,250 $ 153 137,097    
Common stock issued, shares   15,250,000      
Restricted stock issued, net   $ 9 (9)    
Restricted stock issued net, shares   759,000      
Shares repurchased (2,885)   (2,885)    
Shares repurchased, shares   (334,000)      
Exercise of stock options, net $ 191   191    
Exercise of stock options net, shares 588,291 531,000      
Stock-based compensation $ 13,255   13,255    
Other comprehensive income 176     176  
Dividends (19,236)       (19,236)
Net income 36,633       36,633
Balance at Dec. 31, 2018 $ 358,335 $ 1,532 $ 363,655 $ 467 $ (7,319)
Balance, shares at Dec. 31, 2018 153,202,000 153,202,000