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Fixed Assets (Details Textual) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Property, Plant and Equipment [Line Items]      
Depreciation, Total $ 19,645 $ 18,758 $ 17,603
Capital Lease Obligations [Member]
     
Property, Plant and Equipment [Line Items]      
Capital Leases, Lessee Balance Sheet, Assets by Major Class, Accumulated Depreciation 1,417 2,721  
Capital Leased Assets, Gross $ 2,462 $ 3,941