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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   108,379      
Stock-based compensation $ 4,507   $ 4,507    
Change in fair value of derivative instrument, net of income tax (95)       $ (95)
Net income 28,460     $ 28,460  
Ending balance at Jun. 30, 2014 69,963 $ 109 $ 9,832 60,089 $ (67)
Ending balance, shares at Jun. 30, 2014   10,905,843      
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 $ 4,923   $ 4,923    
Change in fair value of derivative instrument, net of income tax (233)       $ (233)
Net income 23,259     $ 23,259  
Ending balance at Jun. 30, 2015 $ 120,656 $ 110 $ 19,447 $ 101,244 $ (145)
Ending balance, shares at Jun. 30, 2015   11,028,265