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CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY (DEFICIT) (Parenthetical)
Dec. 31, 2012
4 percent Convertible Senior Notes  
Stated interest rate 4.00%us-gaap_DebtInstrumentInterestRateStatedPercentage
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Convertible debt | 4 percent Convertible Senior Notes  
Stated interest rate 4.00%us-gaap_DebtInstrumentInterestRateStatedPercentage
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Convertible subordinated debt | 1 7/8 percent Convertible Senior Subordinated Notes  
Stated interest rate 1.875%us-gaap_DebtInstrumentInterestRateStatedPercentage
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