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Fair Value Measurements (Details) (Fair Value, Measurements, Recurring [Member], USD $)
In Thousands, unless otherwise specified
Sep. 30, 2012
Dec. 31, 2011
Fair value measurement of assets and liabilities on recurring basis    
Investment in RealD $ 10,932 $ 9,709
Level 1 [Member]
   
Fair value measurement of assets and liabilities on recurring basis    
Investment in RealD 10,932 9,709
Level 2 [Member]
   
Fair value measurement of assets and liabilities on recurring basis    
Investment in RealD      
Level 3 [Member]
   
Fair value measurement of assets and liabilities on recurring basis    
Investment in RealD     
Interest Rate Swap [Member] | Current Liabilities [Member]
   
Fair value measurement of assets and liabilities on recurring basis    
Interest rate swap liabilities (5,849) (9,979)
Interest Rate Swap [Member] | Current Liabilities [Member] | Level 1 [Member]
   
Fair value measurement of assets and liabilities on recurring basis    
Interest rate swap liabilities     
Interest Rate Swap [Member] | Current Liabilities [Member] | Level 2 [Member]
   
Fair value measurement of assets and liabilities on recurring basis    
Interest rate swap liabilities      
Interest Rate Swap [Member] | Current Liabilities [Member] | Level 3 [Member]
   
Fair value measurement of assets and liabilities on recurring basis    
Interest rate swap liabilities (5,849) (9,979)
Interest Rate Swap [Member] | Long-Term Liabilities [Member]
   
Fair value measurement of assets and liabilities on recurring basis    
Interest rate swap liabilities (10,075) (6,597)
Interest Rate Swap [Member] | Long-Term Liabilities [Member] | Level 1 [Member]
   
Fair value measurement of assets and liabilities on recurring basis    
Interest rate swap liabilities     
Interest Rate Swap [Member] | Long-Term Liabilities [Member] | Level 2 [Member]
   
Fair value measurement of assets and liabilities on recurring basis    
Interest rate swap liabilities      
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 $ (10,075) $ (6,597)