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Property and Equipment (Details) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2015
Mar. 31, 2014
Dec. 31, 2013
Property and equipment      
Gross property and equipment $ 361,319us-gaap_PropertyPlantAndEquipmentGross $ 287,660us-gaap_PropertyPlantAndEquipmentGross $ 273,539us-gaap_PropertyPlantAndEquipmentGross
Less accumulated depreciation and amortization 129,002us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment 103,090us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment 99,473us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment
Net property and equipment 232,317us-gaap_PropertyPlantAndEquipmentNet 184,570us-gaap_PropertyPlantAndEquipmentNet 174,066us-gaap_PropertyPlantAndEquipmentNet
Land      
Property and equipment      
Gross property and equipment 25,543us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_LandMember		 25,531us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_LandMember		 19,954us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_LandMember
Building      
Property and equipment      
Gross property and equipment 38,841us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_BuildingMember		 36,387us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_BuildingMember		 0us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_BuildingMember
Machinery and equipment      
Property and equipment      
Gross property and equipment 158,136us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_MachineryAndEquipmentMember		 98,035us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_MachineryAndEquipmentMember		 84,941us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_MachineryAndEquipmentMember
Furniture and fixtures      
Property and equipment      
Gross property and equipment 36,751us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_FurnitureAndFixturesMember		 31,085us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_FurnitureAndFixturesMember		 25,961us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_FurnitureAndFixturesMember
Leasehold improvements      
Property and equipment      
Gross property and equipment $ 102,048us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_LeaseholdsAndLeaseholdImprovementsMember		 $ 96,622us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_LeaseholdsAndLeaseholdImprovementsMember		 $ 142,683us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_LeaseholdsAndLeaseholdImprovementsMember