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Debt (Details) (USD $)
In Thousands
Sep. 30, 2011
Aug. 01, 2011
Dec. 31, 2010
Debt and capital lease obligations related to continuing operations   
Total Debt$ 1,070,702 $ 1,159,215
Less amounts due within one year746 58,574
Total long-term debt1,069,956 1,100,641
Convertible Notes Payable [Member]
   
Debt and capital lease obligations related to continuing operations   
Total Debt315,940 306,551
Capital Lease Obligations [Member]
   
Debt and capital lease obligations related to continuing operations   
Total Debt2,582 484
$925 Million Credit Facility [Member]
   
Debt and capital lease obligations related to continuing operations   
Total Debt600,000600,0000
$1.0 Billion Credit Facility [Member]
   
Debt and capital lease obligations related to continuing operations   
Total Debt  700,000
Senior Notes, 6.75%, Due 2014 [Member]
   
Debt and capital lease obligations related to continuing operations   
Total Debt$ 152,180 $ 152,180