Supplemental Disclosures to the Condensed Consolidated Balance Sheets and Condensed Consolidated Statements of Cash Flows, Balance Sheets (Details) (USD $)	Sep. 30, 2011	Dec. 31, 2010
Balance Sheet and Cash Flow Supplemental Disclosures [Abstract]
Accrued compensation	$ 14,651,000	$ 18,931,000
Accrued interest	76,032,000	62,999,000
Other	1,140,000	509,000
Other accrued liabilities	91,823,000	82,439,000
Restricted cash	$ 4,000,000	$ 3,000,000