Operations and Summary of Significant Accounting Policies - Intangible Assets (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)	Dec. 31, 2015 USD ($) asset	Dec. 31, 2014 USD ($)	Dec. 31, 2013 USD ($)
Indefinite-Lived Intangible Assets
Intangible assets	$ 2,134	$ 5,666	$ 2,128	$ 2,134	$ 5,666
Indefinite-Lived Intangibles
Indefinite-Lived Intangibles, Balance at the beginning of the year	2,134	5,666
Reclassifications		(3,349)
Foreign exchange	(6)	(183)
Indefinite-Lived Intangibles, Balance at the end of the year	2,128	2,134
Finite-Lived Intangible Assets, Gross			57,065	58,874
Finite-Lived Intangible Assets, Accumulated Amortization			(29,390)	(26,287)
Intangible Assets, Net (Excluding Goodwill)			27,675	32,587
North America
Indefinite-Lived Intangibles
Finite-Lived Intangible Assets, Gross			27,475	29,455
Finite-Lived Intangible Assets, Accumulated Amortization			(14,941)	(14,719)
Intangible Assets, Net (Excluding Goodwill)			12,534	14,736
Europe
Indefinite-Lived Intangibles
Finite-Lived Intangible Assets, Gross			29,590	29,419
Finite-Lived Intangible Assets, Accumulated Amortization			(14,449)	(11,568)
Intangible Assets, Net (Excluding Goodwill)			15,141	17,851
Customer Relationships
Indefinite-Lived Intangibles
Finite-Lived Intangible Assets, Gross			21,242	21,346	22,849
Finite-Lived Intangible Assets, Accumulated Amortization			(13,152)	(11,671)	(11,164)
Intangible Assets, Net (Excluding Goodwill)			8,090	9,675	11,685
Noncompete Agreements Trademarks and Other
Indefinite-Lived Intangibles
Finite-Lived Intangible Assets, Gross			10,578	10,839	13,555
Finite-Lived Intangible Assets, Accumulated Amortization			(7,203)	(5,374)	(3,554)
Intangible Assets, Net (Excluding Goodwill)			3,375	5,465	10,001
Unpatented Technology
Indefinite-Lived Intangibles
Reclassification of intangible assets	3,300
Finite-Lived Intangible Assets, Gross			21,604	22,797	18,977
Finite-Lived Intangible Assets, Accumulated Amortization			(8,656)	(7,665)	(5,257)
Intangible Assets, Net (Excluding Goodwill)			12,948	15,132	13,720
ShearBrace | Unpatented Technology
Indefinite-Lived Intangibles
Reclassification of intangible assets	2,000
Bierbach GmbH And Co. KG | Customer Relationships
Indefinite-Lived Intangibles
Adjustment to intangible asset from business acquisition	600
Bierbach GmbH And Co. KG | Noncompete Agreements Trademarks and Other
Indefinite-Lived Intangibles
Adjustment to intangible asset from business acquisition		500
Bierbach GmbH And Co. KG | Goodwill
Indefinite-Lived Intangibles
Adjustment to intangible asset from business acquisition		100
In Process Research and Development Two [Member]
Indefinite-Lived Intangible Assets
Intangible assets	1,500		1,500
Indefinite-Lived Intangibles
Indefinite-Lived Intangibles, Balance at the end of the year	1,500
Trade Name
Indefinite-Lived Intangible Assets
Intangible assets	616	616	616	616	616
Indefinite-Lived Intangibles
Indefinite-Lived Intangibles, Balance at the beginning of the year	616	616
Reclassifications		0
Foreign exchange	0	0
Indefinite-Lived Intangibles, Balance at the end of the year	616	616
In-process research and development assets
Indefinite-Lived Intangible Assets
Intangible assets	1,518	5,050	$ 1,512	$ 1,518	$ 5,050
Number of indefinite-lived assets | asset			1
Indefinite-Lived Intangibles
Indefinite-Lived Intangibles, Balance at the beginning of the year	1,518	5,050
Reclassifications		(3,349)
Foreign exchange	(6)	(183)
Indefinite-Lived Intangibles, Balance at the end of the year	$ 1,512	$ 1,518