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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 (Loss) Income
Beginning balance at Dec. 31, 2011 $ 42,293 $ 118 $ 295 $ 42,491 $ (611)
Beginning Balance, shares at Dec. 31, 2011    11,792,456       
Tax shortfall associated with stock-based compensation arrangements (418)    (418)      
Restricted stock grants, net of forfeitures and conversions    1 (1)      
Restricted stock grants, net of forfeitures and conversions, shares   80,700      
Stock-based compensation 9,358    9,358      
Common stock dividends (35,609)       (35,609)   
Change in fair value of derivative instrument, net of income tax 66          66
Net income 49,303       49,303   
Balance at Sep. 30, 2012 64,993 119 9,234 56,185 (545)
Balance, shares at Sep. 30, 2012    11,873,156        
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   
Balance at Sep. 30, 2013 $ 56,965 $ 109 $ 6,289 $ 50,586 $ (19)
Balance, shares at Sep. 30, 2013    10,852,020