Property Plant and Equipment, net (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 378,234	$ 331,654
Less accumulated depreciation	(202,648)	(183,829)
Property, plant and equipment, net	175,586	147,825
Depreciation expense	24,100	23,800	$ 20,800
Capital leased assets	1,600	1,500
Capital leases accumulated depreciation	100
Land [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	14,115	12,873
Buildings [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	93,465	79,477
Leasehold Improvements [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	18,430	17,341
Machinery, office furniture and equipment [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	242,147	216,527
Construction in process [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	10,077	$ 5,436
Assets Held under Capital Leases [Member]
Property, Plant and Equipment [Line Items]
Depreciation expense	$ 100