Acquisitions Fauchier Acquisition (Details) - Fauchier [Member] - USD ($) $ in Thousands		3 Months Ended
		Mar. 31, 2013	Mar. 31, 2017	Aug. 31, 2016	May 05, 2015
Business Acquisition [Line Items]
Payments to Acquire Businesses, Gross		$ 63,433
Business Acquisition, Preacquisition Contingency, Amount of Settlement				$ (6,587)	$ (22,765)
Business Combination, Contingent Consideration Arrangements, Range of Outcomes, Value, High	[1]		$ 0

[1] Using the applicable exchange rate as of March 31, 2017, for amounts denominated in currencies other than the U.S. dollar.