Assets (Details 4) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014	Dec. 31, 2014	Dec. 04, 2014
Property, plant and equipment, net
Gross property, plant, and equipment	$ 176,061		$ 176,061		$ 170,542
Less accumulated depreciation and amortization	96,059		96,059		91,790
Net property, plant and equipment	80,002		80,002		78,752
Depreciation	3,000	$ 2,900	5,800	$ 5,800
Goodwill
Impairment of goodwill			0
Goodwill acquired			0
Gross carrying Amount, beginning balance			238,158
Accumulated Impairment, beginning balance			123,199
Net Amount, beginning balance			114,959
Purchase price adjustment			297
Gross carrying Amount, ending balance	238,455		238,455
Accumulated Impairment, ending balance	123,199		123,199
Net Amount, ending balance	115,256		115,256
Intangible assets
Impairment of intangible assets			0
Intangible assets acquired			0
Accumulated Amortization and Impairment	139,146		139,146		123,205
Total Gross Intangible Assets	282,513		282,513		282,513
Total Net Intangible Assets	143,367		143,367		159,308
Indefinite-lived trademark
Intangible assets
Indefinite-lived intangible assets	2,900		2,900		2,900
Technology
Intangible assets
Gross Carrying Amount	222,358		222,358		222,358
Accumulated Amortization and Impairment	113,419		113,419		106,342
Net Amount	108,939		108,939		116,016
Customer relationships
Intangible assets
Gross Carrying Amount	47,885		47,885		47,885
Accumulated Amortization and Impairment	18,685		18,685		14,918
Net Amount	29,200		29,200		32,967
Trademarks and tradenames
Intangible assets
Gross Carrying Amount	3,050		3,050		3,050
Accumulated Amortization and Impairment	1,717		1,717		1,096
Net Amount	1,333		1,333		1,954
Other
Intangible assets
Gross Carrying Amount	6,320		6,320		6,320
Accumulated Amortization and Impairment	5,325		5,325		849
Net Amount	995		995		5,471
Tools
Property, plant and equipment, net
Assets held for sale	1,000		1,000		1,300
Land
Property, plant and equipment, net
Gross property, plant, and equipment	9,392		9,392		9,392
Building and improvements
Property, plant and equipment, net
Gross property, plant, and equipment	54,118		54,118		51,979
Machinery and equipment
Property, plant and equipment, net
Gross property, plant, and equipment	107,153		107,153		104,815
Leaseholds improvements
Property, plant and equipment, net
Gross property, plant, and equipment	$ 5,398		$ 5,398		$ 4,356
PSP
Goodwill
Net assets acquired						$ 145,500