Fair Value Measurements (Details) (Fair Value, Measurements, Recurring [Member], USD $) In Thousands, unless otherwise specified	Jun. 30, 2012	Dec. 31, 2011	Jun. 30, 2012 Level 1 [Member]	Jun. 30, 2011 Level 1 [Member]	Jun. 30, 2012 Level 2 [Member]	Dec. 31, 2011 Level 2 [Member]	Jun. 30, 2012 Level 3 [Member]	Dec. 31, 2011 Level 3 [Member]	Jun. 30, 2012 Interest Rate Swap [Member] Current Liabilities [Member]	Dec. 31, 2011 Interest Rate Swap [Member] Current Liabilities [Member]	Jun. 30, 2012 Interest Rate Swap [Member] Current Liabilities [Member] Level 1 [Member]	Dec. 31, 2011 Interest Rate Swap [Member] Current Liabilities [Member] Level 1 [Member]	Jun. 30, 2012 Interest Rate Swap [Member] Current Liabilities [Member] Level 2 [Member]	Dec. 31, 2011 Interest Rate Swap [Member] Current Liabilities [Member] Level 2 [Member]	Jun. 30, 2012 Interest Rate Swap [Member] Current Liabilities [Member] Level 3 [Member]	Dec. 31, 2011 Interest Rate Swap [Member] Current Liabilities [Member] Level 3 [Member]	Jun. 30, 2012 Interest Rate Swap [Member] Long-Term Liabilities [Member]	Dec. 31, 2011 Interest Rate Swap [Member] Long-Term Liabilities [Member]	Jun. 30, 2012 Interest Rate Swap [Member] Long-Term Liabilities [Member] Level 1 [Member]	Dec. 31, 2011 Interest Rate Swap [Member] Long-Term Liabilities [Member] Level 1 [Member]	Jun. 30, 2012 Interest Rate Swap [Member] Long-Term Liabilities [Member] Level 2 [Member]	Dec. 31, 2011 Interest Rate Swap [Member] Long-Term Liabilities [Member] Level 2 [Member]	Jun. 30, 2012 Interest Rate Swap [Member] Long-Term Liabilities [Member] Level 3 [Member]	Dec. 31, 2011 Interest Rate Swap [Member] Long-Term Liabilities [Member] Level 3 [Member]
Fair value measurement of assets and liabilities on recurring basis
Interest rate swap liabilities									$ (6,783)	$ (9,979)					$ (6,783)	$ (9,979)	$ (9,206)	$ (6,597)					$ (9,206)	$ (6,597)
Investment in Real D	$ 18,293	$ 9,709	$ 18,293	$ 9,709