Acquisitions - Narrative (Details) $ in Thousands			3 Months Ended	9 Months Ended
	Sep. 21, 2016 USD ($)	Aug. 11, 2015 USD ($)	Mar. 31, 2016 USD ($) Acquisition	Sep. 30, 2016 USD ($)	Sep. 30, 2015 USD ($)
Business Acquisition [Line Items]
Cash paid, net of cash acquired				$ 1,341	$ 13,269
Maxxton Holding B.V. (“MHB”)
Business Acquisition [Line Items]
Voting equity interest acquired (percent)		100.00%
Total consideration for acquisition		$ 23,600
Cash paid, net of cash acquired		13,300
Deferred purchase price payable		6,800
Liabilities assumed		$ 3,500
Deferred purchase price payment period		5 years
Variable compensation arrangement term		5 years
Series of Individually Immaterial Business Acquisitions
Business Acquisition [Line Items]
Total consideration for acquisition			$ 25,800
Deferred purchase price payable			$ 200
Number of acquisitions of real estate | Acquisition			3
Cash paid, net of cash acquired			$ 25,600
Acquisition related costs			$ 500
Indianapolis, IN
Business Acquisition [Line Items]
Proceeds from the sale of property	$ 6,700
Gain on sale of property	$ 400