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Fixed Assets - Textual (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Property, Plant and Equipment [Line Items]      
Depreciation $ 16,462us-gaap_Depreciation $ 16,742us-gaap_Depreciation $ 15,999us-gaap_Depreciation
Capital Lease Obligations      
Property, Plant and Equipment [Line Items]      
Capital leased assets, gross 2,072us-gaap_CapitalLeasedAssetsGross
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_CapitalLeaseObligationsMember
2,462us-gaap_CapitalLeasedAssetsGross
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_CapitalLeaseObligationsMember
 
Capital leases, lessee balance sheet, assets by major class, accumulated depreciation $ 1,091us-gaap_CapitalLeasesLesseeBalanceSheetAssetsByMajorClassAccumulatedDeprecation
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_CapitalLeaseObligationsMember
$ 1,417us-gaap_CapitalLeasesLesseeBalanceSheetAssetsByMajorClassAccumulatedDeprecation
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_CapitalLeaseObligationsMember