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Unaudited Condensed Consolidated Statements of Stockholders' Equity (USD $)
In Thousands, except Share data
Total
Common Stock
Additional Paid-in Capital
Retained Earnings
Accumulated Other Comprehensive Income (Loss)
Beginning balance at Dec. 31, 2012 $ 40,988 $ 114 $ 299 $ 41,311 $ (736)
Beginning balance, shares at Dec. 31, 2012    11,387,299        
Tax shortfall associated with stock-based compensation arrangements (3,521)   (656) (2,865)   
Repurchase of common stock (24,999) (5) (1,752) (23,242)   
Repurchase of common stock, shares   (495,085)      
Restricted stock grants, net of forfeitures and conversions               
Restricted stock grants, net of forfeitures and conversions, shares   (40,194)      
Stock-based compensation 8,398    8,398      
Change in fair value of derivative instrument, net of income tax 717       717
Net income 35,382     35,382  
Ending balance at Sep. 30, 2013 56,965 109 6,289 50,586 (19)
Ending balance, shares at Sep. 30, 2013    10,852,020      
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