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Consolidated Statements Of Stockholders' Equity (USD $)
In Thousands, except Share data
Common Stock [Member]
Treasury Stock [Member]
Retained Earnings [Member]
Accumulated Other Comprehensive Loss [Member]
Total
BALANCE at Dec. 31, 2010$ 434,169$ (90,076)$ 101,979$ (2,950)$ 443,122
BALANCE (in shares) at Dec. 31, 201031,815,085   31,815,085
Proceeds from exercise of options, net (in shares)74,335   74,000
Proceeds from exercise of options, net2,182   2,182
Adjustments related to tax withholding for share-based compensation (in shares)(38,467)    
Adjustments related to tax withholding for share-based compensation(1,749)   (1,749)
Share-based payments expense (in shares)276,022    
Share-based payments expense9,362   9,362
Tax benefit on share-based compensation expense2,431   2,431
Debt conversion feature26,854   26,854
Repurchases of common stock and ASR program (in shares)(1,374,036)    
Repurchases of common stock and ASR program (63,349)  (63,349)
Net income  72,361 72,361
Foreign currency translation adj. net of tax expense (benefit)   (122)(122)
Interest rate hedges on long-term debt net of tax expense   547547
Unrealized losses on short-term investments net of tax benefit   (13)(13)
BALANCE at Sep. 30, 2011473,249(153,425)174,340(2,538)491,626
BALANCE (in shares) at Sep. 30, 201130,752,939   30,752,939
BALANCE at Jun. 30, 2011471,540(153,425)137,214(1,706)453,623
BALANCE (in shares) at Jun. 30, 201130,724,304    
Proceeds from exercise of options, net (in shares)26,591    
Proceeds from exercise of options, net780   780
Adjustments related to tax withholding for share-based compensation (in shares)(1,424)    
Adjustments related to tax withholding for share-based compensation(57)   (57)
Share-based payments expense (in shares)3,468    
Share-based payments expense869   869
Tax benefit on share-based compensation expense117   117
Net income  37,126 37,126
Foreign currency translation adj. net of tax expense (benefit)   (832)(832)
BALANCE at Sep. 30, 2011$ 473,249 $ 174,340$ (2,538)$ 491,626
BALANCE (in shares) at Sep. 30, 201130,752,939   30,752,939