Screenvision Exhibition Inc (Details) (USD $) In Thousands, unless otherwise specified			3 Months Ended
	Mar. 31, 2013	Dec. 31, 2012	Mar. 31, 2013 SV Holdco [Member]
Investment in unconsolidated affiliates
Balance at January 1, 2013	$ 6,231	$ 7,682	$ 6,740
Equity earnings of SV Holdco			(1,442)
Balance at March 31, 2013	6,231	7,682	5,298
Deferred revenue
Balance at January 1, 2013			34,141
Amortization of up-front payment			(237)
Amortization of Class C units			(52)
Balance at March 31, 2013			$ 33,852