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Unaudited Condensed Consolidated Statements of Stockholders' Equity - USD ($)
$ in Thousands
Total
Common Stock
Additional Paid-in Capital
Retained Earnings
Accumulated Other Comprehensive Income (Loss)
Beginning balance at Dec. 31, 2013 $ 38,902 $ 108 $ 7,137 $ 31,629 $ 28
Beginning balance, shares at Dec. 31, 2013   10,797,464      
Tax shortfall associated with stock-based compensation arrangements $ (1,811) (1,811)
Restricted stock grants, net of forfeitures and conversions $ 1 (1)  
Restricted stock grants, net of forfeitures and conversions, shares   105,877      
Stock-based compensation $ 7,058 $ 7,058
Change in fair value of derivative instrument, net of income tax 156       $ 156
Net income 33,413 $ 33,413
Ending balance at Sep. 30, 2014 77,718 $ 109 $ 12,383 65,042 $ 184
Ending balance, shares at Sep. 30, 2014   10,903,341      
Beginning balance at Dec. 31, 2014 92,732 $ 109 14,550 $ 77,985 $ 88
Beginning balance, shares at Dec. 31, 2014   10,903,341      
Tax shortfall associated with stock-based compensation arrangements $ (25)   (25)    
Restricted stock grants, net of forfeitures and conversions $ 1 (1)
Restricted stock grants, net of forfeitures and conversions, shares   124,924      
Stock-based compensation $ 7,576 $ 7,576
Change in fair value of derivative instrument, net of income tax (88) $ (88)
Net income 26,982 $ 26,982
Ending balance at Sep. 30, 2015 $ 127,177 $ 110 $ 22,100 $ 104,967
Ending balance, shares at Sep. 30, 2015   11,028,265