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Debt Schedule of Long-Term Debt Repayments (Details) (USD $)
In Thousands
3 Months Ended9 Months Ended
Sep. 30, 2011
Sep. 30, 2010
Sep. 30, 2011
Sep. 30, 2010
Debt Instrument [Line Items]    
Repayments of Long-term Debt  $ 804,304$ 106,524
2007 Senior Secured Credit Facility [Member] | Secured Debt [Member] | Line of Credit [Member]
    
Debt Instrument [Line Items]    
Repayments of Long-term Debt170,000[1]0[1]170,000[1]0[1]
2007 Senior Secured Credit Facility [Member] | Secured Debt [Member]
    
Debt Instrument [Line Items]    
Repayments of Long-term Debt351,32032,643406,950106,524
2011 Senior Secured Credit Facility [Member] | Secured Debt [Member]
    
Debt Instrument [Line Items]    
Repayments of Long-term Debt3,75003,7500
Secured Debt [Member] | Credit Facilities [Member]
    
Debt Instrument [Line Items]    
Repayments of Long-term Debt$ 525,070$ 32,643$ 580,700$ 106,524
[1](1) See repayment of the convertible senior subordinated notes below.