Acquisitions - Identifiable Assets Acquired and Liabilities Assumed (Details) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016	Jul. 07, 2016
Business Acquisition [Line Items]
Goodwill (Note 4)	$ 66,854	$ 63,606
Texel
Business Acquisition [Line Items]
Cash and cash equivalents			$ 1,610
Accounts receivable			13,355
Inventories			17,525
Prepaid expenses and other current assets			2,469
Non-current environmental indemnification receivable (Note 14)			925
Property, plant and equipment, net			31,525
Investment in joint venture			616
Goodwill (Note 4)			28,655
Other intangible assets, net (Note 4)			22,887
Other long term assets			0
Total assets acquired			119,567
Current liabilities			(8,520)
Long-term environmental remediation liability (Note 14)			(925)
Deferred tax liabilities			(7,413)
Other long-term liabilities			0
Total liabilities assumed			(16,858)
Net assets acquired			$ 102,709
Gutsche
Business Acquisition [Line Items]
Cash and cash equivalents		9,400
Accounts receivable		7,736
Inventories		6,417
Prepaid expenses and other current assets		1,125
Non-current environmental indemnification receivable (Note 14)		0
Property, plant and equipment, net		7,969
Investment in joint venture		0
Goodwill (Note 4)		19,759
Other intangible assets, net (Note 4)		15,622
Other long term assets		1,545
Total assets acquired		69,573
Current liabilities		(8,376)
Long-term environmental remediation liability (Note 14)		0
Deferred tax liabilities		(470)
Other long-term liabilities		(2,742)
Total liabilities assumed		(11,588)
Net assets acquired		$ 57,985