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Condensed Statements Of Changes In Stockholders' Equity (USD $)
In Thousands, except Share data
Common Stock [Member]
Additional Paid-In Capital [Member]
Treasury Stock [Member]
Accumulated Other Comprehensive Income (Loss) [Member]
Retained Earnings (Accumulated Deficit) [Member]
Total Comprehensive Income [Member]
Total
Beginning balance at Dec. 31, 2009$ 20$ 158,325 $ 251$ (19,500) $ 139,096
Beginning balance, shares at Dec. 31, 200920,429,736      
Net income    7,1717,1717,171
Unrealized gain (loss) from available-for-sale securities, net   81 8181
Unrealized gain (loss) from hedging activities, net   89 8989
Total comprehensive income     7,341 
Equity-based compensation 1,661    1,661
Tax benefit related to exercise of stock options 1,125    1,125
Issuance of Common Stock upon exercise of stock options, shares894,897      
Issuance of Common Stock upon exercise of stock options15,642    5,643
Issuance of Common Stock under employee stock purchase plan, shares133,826      
Issuance of Common Stock under employee stock purchase plan [1]795    795
Purchase of Treasury Stock, shares(139,709)      
Purchase of Treasury Stock [1] (1,567)   (1,567)
Issuance of Treasury Stock upon exercise of stock options, shares91,389      
Issuance of Treasury Stock upon exercise of stock options [1]11,027 (340) 688
Issuance of Treasury Stock under employee stock purchase plan [1] 540 (248) 292
Issuance of Treasury Stock under employee stock purchase plan, shares48,320      
Ending balance at Sep. 30, 201021167,549 421(12,917) 155,074
Ending balance, shares at Sep. 30, 201021,458,459      
Beginning balance at Dec. 31, 201023176,838 317(8,710) 168,468
Beginning balance, shares at Dec. 31, 201022,524,449      
Net income    13,70913,70913,709
Unrealized gain (loss) from available-for-sale securities, net   (834) (834)(834)
Unrealized gain (loss) from hedging activities, net   (369) (369)(369)
Total comprehensive income     12,506 
Equity-based compensation 3,540    3,540
Tax benefit related to exercise of stock options 1,223    1,223
Issuance of Common Stock upon exercise of stock options, shares773,666      
Issuance of Common Stock upon exercise of stock options [1]6,419    6,419
Issuance of Common Stock under employee stock purchase plan, shares131,306      
Issuance of Common Stock under employee stock purchase plan [1]1,236    1,236
Ending balance at Sep. 30, 2011$ 23$ 189,256 $ (886)$ 4,999 $ 193,392
Ending balance, shares at Sep. 30, 201123,429,421      
[1]Amount less than $1.