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Investment in Digital Cinema Implementation Partners (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
Sep. 30, 2011
Summary of changes in the Company's investment in DCIP        
Beginning balance     $ 12,798  
Equity in earnings 6,844 1,719 9,622 2,353
Ending balance 20,267   20,267  
Digital Cinema Implementation Partners LLC [Member]
       
Summary of changes in the Company's investment in DCIP        
Beginning balance     12,798  
Cash contributions to DCIP     1,325  
Equity in earnings     6,144 (1,927)
Ending balance $ 20,267   $ 20,267