Fair values as of the balance sheet date of all assets resulting from contracts that meet the criteria of being accounted for as derivative instruments, net of the effects of master netting arrangements.

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Fair Value Measurements (Details) (USD $) In Thousands	9 Months Ended
Fair Value Measurements (Details) (USD $) In Thousands	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2011 Interest Rate Swap [Member] Current Liabilities [Member] Fair Value, Measurements, Recurring [Member]	Dec. 31, 2010 Interest Rate Swap [Member] Current Liabilities [Member] Fair Value, Measurements, Recurring [Member]	Sep. 30, 2011 Interest Rate Swap [Member] Current Liabilities [Member] Fair Value, Measurements, Recurring [Member] Fair Value, Inputs, Level 1 [Member]	Dec. 31, 2010 Interest Rate Swap [Member] Current Liabilities [Member] Fair Value, Measurements, Recurring [Member] Fair Value, Inputs, Level 1 [Member]	Sep. 30, 2011 Interest Rate Swap [Member] Current Liabilities [Member] Fair Value, Measurements, Recurring [Member] Fair Value, Inputs, Level 2 [Member]	Dec. 31, 2010 Interest Rate Swap [Member] Current Liabilities [Member] Fair Value, Measurements, Recurring [Member] Fair Value, Inputs, Level 2 [Member]	Sep. 30, 2011 Interest Rate Swap [Member] Current Liabilities [Member] Fair Value, Measurements, Recurring [Member] Fair Value, Inputs, Level 3 [Member]	Dec. 31, 2010 Interest Rate Swap [Member] Current Liabilities [Member] Fair Value, Measurements, Recurring [Member] Fair Value, Inputs, Level 3 [Member]	Sep. 30, 2011 Interest Rate Swap [Member] Long-Term Liabilities [Member] Fair Value, Measurements, Recurring [Member]	Dec. 31, 2010 Interest Rate Swap [Member] Long-Term Liabilities [Member] Fair Value, Measurements, Recurring [Member]	Sep. 30, 2011 Interest Rate Swap [Member] Long-Term Liabilities [Member] Fair Value, Measurements, Recurring [Member] Fair Value, Inputs, Level 1 [Member]	Dec. 31, 2010 Interest Rate Swap [Member] Long-Term Liabilities [Member] Fair Value, Measurements, Recurring [Member] Fair Value, Inputs, Level 1 [Member]	Sep. 30, 2011 Interest Rate Swap [Member] Long-Term Liabilities [Member] Fair Value, Measurements, Recurring [Member] Fair Value, Inputs, Level 2 [Member]	Dec. 31, 2010 Interest Rate Swap [Member] Long-Term Liabilities [Member] Fair Value, Measurements, Recurring [Member] Fair Value, Inputs, Level 2 [Member]	Sep. 30, 2011 Interest Rate Swap [Member] Long-Term Liabilities [Member] Fair Value, Measurements, Recurring [Member] Fair Value, Inputs, Level 3 [Member]	Dec. 31, 2010 Interest Rate Swap [Member] Long-Term Liabilities [Member] Fair Value, Measurements, Recurring [Member] Fair Value, Inputs, Level 3 [Member]	Dec. 31, 2010 Interest Rate Swap [Member] Long-Term Asset [Member] Fair Value, Measurements, Recurring [Member]	Dec. 31, 2010 Interest Rate Swap [Member] Long-Term Asset [Member] Fair Value, Measurements, Recurring [Member] Fair Value, Inputs, Level 1 [Member]	Dec. 31, 2010 Interest Rate Swap [Member] Long-Term Asset [Member] Fair Value, Measurements, Recurring [Member] Fair Value, Inputs, Level 2 [Member]	Dec. 31, 2010 Interest Rate Swap [Member] Long-Term Asset [Member] Fair Value, Measurements, Recurring [Member] Fair Value, Inputs, Level 3 [Member]	Sep. 30, 2011 Fair Value, Measurements, Recurring [Member]	Dec. 31, 2010 Fair Value, Measurements, Recurring [Member]	Sep. 30, 2011 Fair Value, Measurements, Recurring [Member] Fair Value, Inputs, Level 1 [Member]	Dec. 31, 2010 Fair Value, Measurements, Recurring [Member] Fair Value, Inputs, Level 1 [Member]	Sep. 30, 2011 Fair Value, Measurements, Recurring [Member] Fair Value, Inputs, Level 2 [Member]	Dec. 31, 2010 Fair Value, Measurements, Recurring [Member] Fair Value, Inputs, Level 2 [Member]	Sep. 30, 2011 Fair Value, Measurements, Recurring [Member] Fair Value, Inputs, Level 3 [Member]	Dec. 31, 2010 Fair Value, Measurements, Recurring [Member] Fair Value, Inputs, Level 3 [Member]
Fair value measurement of assets and liabilities on recurring basis
Interest rate swap liabilities			$ (12,326)	$ (2,928)	$ 0	$ 0	$ 0	$ 0	$ (12,326)	$ (2,928)	$ (5,680)	$ (13,042)	$ 0	$ 0	$ 0	$ 0	$ (5,680)	$ (13,042)
Interest rate swap assets																			8,955	0	0	8,955
Investment in Real D																							11,433	27,993	11,433	0	0	27,993	0	0
Reconciliation Of Beginning And Ending Balance For Assets And Liabilities Measured At Fair Value
Beginning balance - Assets	8,955
Beginning balance - Liabilities	(15,970)	(18,524)
Total loss included in accumulated other comprehensive income ( loss ) , Liabilities	(2,790)	(363)
Total loss included in accumulated other comprehensive income ( loss ) ,Assets	(8,955)
Total gain included in earnings, Liabilities	754
Total gain included in earnings, Assets	0
Ending balance - Liabilities	(18,006)	(18,887)
Ending balance - Assets	$ 0