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Earnings (Loss) Per Share (Details) (USD $)
In Thousands, except Per Share data, unless otherwise specified
 3 Months Ended 12 Months Ended
Dec. 31, 2011
Sep. 30, 2011
Jun. 30, 2011
Mar. 31, 2011
Dec. 31, 2010
Sep. 30, 2010
Jun. 30, 2010
Mar. 31, 2010
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Denominator:                      
Weighted-average common shares outstanding 110,171 112,334 109,992 107,613 111,530 111,866 113,321 113,132 110,041 112,456 105,011
Basic net income (loss) per share (in dollars per share) $ (0.26) $ 0.00 $ (0.10) $ (0.04) $ 0.30 $ (0.18) $ (0.11) $ 1.33 $ (0.39) $ 1.34 $ (0.88)
Denominator:                      
Number of shares used in basic computation 110,171 112,334 109,992 107,613 111,530 111,866 113,321 113,132 110,041 112,456 105,011
Number of shares used in diluted computation 110,171 115,552 109,992 107,613 114,461 111,866 113,321 117,463 110,041 115,884 105,011
Diluted net income (loss) per share (in dollars per share) $ (0.26) $ 0.00 $ (0.10) $ (0.04) $ 0.29 $ (0.18) $ (0.11) $ 1.28 $ (0.39) $ 1.30 $ (0.88)
CRCS
                      
Numerator:                      
Allocation of undistributed earnings                 $ (1,180) $ 6,109  
Denominator:                      
Weighted-average common shares outstanding                 4,788 4,552  
Basic net income (loss) per share (in dollars per share)                 $ (0.25) $ 1.34  
Numerator:                      
Allocation of undistributed earnings for basic computation                 (1,180) 6,109  
Reallocation of undistributed earnings                   (181)  
Allocation of undistributed earnings for diluted computation                 (1,180) 5,928  
Denominator:                      
Number of shares used in basic computation                 4,788 4,552  
Number of shares used in diluted computation                 4,788 4,552  
Diluted net income (loss) per share (in dollars per share)                 $ (0.25) $ 1.30  
Common Stock
                      
Numerator:                      
Allocation of undistributed earnings                 (41,873) 144,808 (92,186)
Denominator:                      
Weighted-average common shares outstanding                 107,024 107,904 105,011
Basic net income (loss) per share (in dollars per share)                 $ (0.39) $ 1.34 $ (0.88)
Numerator:                      
Allocation of undistributed earnings for basic computation                 (41,873) 144,808 (92,186)
Reallocation of undistributed earnings                   181  
Allocation of undistributed earnings for diluted computation                 $ (41,873) $ 144,989 $ (92,168)
Denominator:                      
Number of shares used in basic computation                 107,024 107,904 105,011
Dilutive potential shares from stock options, ESPP, Convertible notes and nonvested equity stock and stock units (in shares)                   3,428  
Number of shares used in diluted computation                 107,024 111,332 105,011
Diluted net income (loss) per share (in dollars per share)                 $ (0.39) $ 1.30 $ (0.88)