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Investment in Digital Cinema Implementation Partners (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
Summary of changes in the Company's investment in DCIP        
Beginning balance     $ 12,798  
Equity in income 988 (1,804) 2,778 634
Ending balance 16,202   16,202  
Digital Cinema Implementation Partners LLC [Member]
       
Summary of changes in the Company's investment in DCIP        
Beginning balance     12,798  
Cash contributions to DCIP     407  
Equity in income     2,997 (283)
Ending balance $ 16,202   $ 16,202