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Other Liabilities (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2012
Dec. 31, 2011
Schedule of other liabilities    
Deferred revenue $ 8,657 $ 16,657
Noncurrent pension liability 10,494 11,724
Other 1,629 2,004
Other liabilities $ 20,780 $ 30,385