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Fixed Assets (Details Textual) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Depreciation $ 19,076 $ 17,649 $ 16,441
Capital Lease Obligations [Member]
     
Capital Leased Assets, Gross 3,941 4,243  
Capital Leases, Lessee Balance Sheet, Assets by Major Class, Accumulated Depreciation $ 2,721 $ 2,816