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Divestments - (Details) - USD ($) $ in Thousands			3 Months Ended		6 Months Ended
	May 30, 2017	May 04, 2016	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017	Dec. 31, 2017
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Cash proceeds from divestment					$ 0	$ 2,423
Income (loss) from discontinued operations, net of tax			$ (360)	$ (2,026)	(822)	(2,363)
Disposal Group, Not Discontinued Operation, Gain (Loss) on Disposal					0	38,869
Initial United States Divestments | Discontinued Operations, Disposed of by Sale
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Disposal, consideration		$ 80,000
Cash proceeds from divestment		55,000
Disposal Group, Including Discontinued Operation, Contingent Receivable		$ 25,000
Recall Divestments [Member] | Discontinued Operations, Disposed of by Sale
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Income (Loss) from Discontinued Operations Before Provision (Benefit) for Income Taxes			(477)	(3,049)	(973)	(3,478)
Discontinued Operation, Tax Effect of Discontinued Operation			(117)	(1,023)	(151)	(1,115)
Income (loss) from discontinued operations, net of tax			(360)	(2,026)	(822)	(2,363)
Russia and Ukraine Divestment | Disposal Group, Not Discontinued Operations
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Disposal group, equity interest	25.00%
Disposal Group, Not Discontinued Operation, Gain (Loss) on Disposal				38,869		38,869
Disposal group, cumulative translation adjustment	$ 29,100			$ 29,100		$ 29,100
Disposal Group, Including Discontinued Operation, Net Assets Excluding Goodwill	4,716
Disposal Group, Including Discontinued Operation, Goodwill	3,515
Other Assets | Russia and Ukraine Divestment | Disposal Group, Not Discontinued Operations
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Equity method investment, fair value	18,000		$ 17,445		$ 17,445		$ 17,539
Equity method investments, carrying value	$ 20,869

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