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Condensed Consolidated Statements Of Stockholders' Equity (USD $)
In Thousands, except Share data
Common Stock [Member]
Additional Paid-In Capital [Member]
Retained Earnings [Member]
Accumulated Other Comprehensive Income (Loss) [Member]
Total
Balance at Dec. 31, 2010 $ 133 $ 1,206 $ 174,625 $ 40 $ 176,004
Balance, shares at Dec. 31, 2010 13,316,822        
Tax shortfall associated with stock-based compensation arrangements   (933)     (933)
Repurchase of common stock (9) (3,165) (124,063)   (127,237)
Repurchase of common stock, shares (936,185)        
Restricted stock grants, net of forfeitures, shares 65,852        
Stock-based compensation   2,892     2,892
Common stock dividends     (13,174)   (13,174)
Change in net unrealized gains and losses on marketable securities, net of income tax       (40) (40)
Net income     35,791   35,791
Balance at Mar. 31, 2011 124   73,179   73,303
Balance, shares at Mar. 31, 2011 12,446,489        
Balance at Dec. 31, 2011 118 295 42,491 (611) 42,293
Balance, shares at Dec. 31, 2011 11,792,456        
Tax shortfall associated with stock-based compensation arrangements   (740)     (740)
Restricted stock grants, net of forfeitures 1 (1)      
Restricted stock grants, net of forfeitures, shares 71,484        
Stock-based compensation   2,390     2,390
Common stock dividends     (11,865)   (11,865)
Change in fair value of derivative instrument, net of income tax       (41) (41)
Net income     23,989   23,989
Balance at Mar. 31, 2012 $ 119 $ 1,944 $ 54,615 $ (652) $ 56,026
Balance, shares at Mar. 31, 2012 11,863,940