Acquisitions Schedule of recognized Identified Assets Acquired and Liabilities Assumed (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Nov. 23, 2016	Dec. 31, 2015	Jan. 22, 2015
Assets:
Goodwill	$ 208,431		$ 175,453
DeWAL
Assets:
Cash and equivalents		$ 1,539
Accounts receivable		7,513
Other current assets		691
Inventory		9,915
Property, plant & equipment		9,929
Intangible assets		73,500
Goodwill		35,638
Other long-term assets		221
Total assets		138,946
Liabilities:
Accounts payable		2,402
Other current liabilities		1,062
Total liabilities		3,464
Fair value of net assets acquired		$ 135,482
Arlon
Assets:
Cash and equivalents				$ 142
Accounts receivable				17,301
Other current assets				856
Inventory				9,916
Deferred income tax assets, current				1,084
Property, plant & equipment				30,667
Intangible assets				50,020
Goodwill				85,565
Other long-term assets				106
Total assets				195,657
Liabilities:
Accounts payable				4,958
Other current liabilities				4,385
Deferred tax liability				23,225
Other long-term liabilities				4,540
Total liabilities				37,108
Fair value of net assets acquired				$ 158,549