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Statement of Stockholders' Equity (Details) (USD $)
In Thousands, except Share data, unless otherwise specified
Common Stock
Additional Paid-In Capital
Accumulated other comprehensive loss
Retained Earnings/(Accumulated Deficit)
Total
Balance at Dec. 31, 2011 $ 206 $ 79,512 $ (20) $ (25,123) $ 54,575
Balance (in shares) at Dec. 31, 2011 20,622,889       20,622,889
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Exercise of common stock options 16 5,770     5,786
Exercise of common stock options (in shares) 1,570,000        
Issuance of unrestricted stock 1 (1)      
Issuance of unrestricted stock (in shares) 77,000        
Shares surrendered by employees to pay taxes related to unrestricted stock   (37)     (37)
Shares surrendered by employees to pay taxes related to unrestricted stock (in shares) (12,000)        
Issuance of common stock under employee stock purchase plan   12     12
Issuance of common stock under employee stock purchase plan (in shares) 2,000        
Stock-based compensation expense   278     278
Tax benefits from stock-based awards   12,684     12,684
Dividend payment       (25,507) (25,507)
Accumulated other comprehensive loss     20   20
Net income       56,044 56,044
Balance at Jun. 30, 2012 $ 223 $ 98,218   $ 5,414 $ 103,855
Balance (in shares) at Jun. 30, 2012 22,260,377       22,260,377