Acquisitions (Details) - USD ($) $ in Thousands	1 Months Ended			12 Months Ended
	Dec. 31, 2015	Nov. 30, 2013	Feb. 28, 2013	Dec. 31, 2014	Dec. 31, 2013
Acquisitions
Goodwill	$ 123,950			$ 123,881	$ 129,218
North America
Acquisitions
Goodwill	85,834			84,526	84,822
Europe
Acquisitions
Goodwill	36,720			37,788	$ 42,690
ShearBrace | North America
Acquisitions
Cash paid for acquisition			$ 5,300
Goodwill			2,600
Intangible assets			$ 1,900
Weighted-average amortization period		13 years 4 months 24 days
Bierbach GmbH and Co KG | Europe
Acquisitions
Cash paid for acquisition		$ 1,200
Goodwill		500
Intangible assets		600
Contingent consideration payable		$ 800		200
Weighted-average amortization period		9 years 8 months 12 days
Bierbach GmbH and Co KG | Europe | General and Administrative Expense
Acquisitions
Gain due to adjustment of contingent consideration payable				$ (500)
EBTY | North America
Acquisitions
Cash paid for acquisition	3,400
Goodwill	2,000
Intangible assets	$ 1,100
Weighted-average amortization period	7 years