Divestments - (Details) £ in Thousands, AUD in Thousands, $ in Thousands					3 Months Ended		6 Months Ended
	May 30, 2017	Dec. 29, 2016 USD ($)	Oct. 31, 2016 AUD	May 04, 2016 USD ($)	Jun. 30, 2017 USD ($)	Jun. 30, 2016 USD ($)	Jun. 30, 2017 USD ($)	Jun. 30, 2016 USD ($)	Dec. 09, 2016 USD ($)	Dec. 09, 2016 GBP (£)	Oct. 31, 2016 USD ($)	Oct. 31, 2016 AUD
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Disposal Group, Including Discontinued Operation, Revenue						$ 4,009		$ 4,009
Cash proceeds from divestment							$ 2,423	53,950
Disposal group, gain on sale of disposal							38,869	0
Equity method investment, fair value					$ 18,000	0	18,000	0
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 Group, Including Discontinued Operation, Revenue						0		0
Disposal, consideration				$ 80,000
Cash proceeds from divestment				55,000
Disposal group, contingent receivable				25,000
Disposal group, contingent consideration receivable, net of adjustments				21,400
Disposal group, contingent consideration receivable, fair value adjustment				2,200
Disposal group, contingent consideration receivable, present value adjustment				$ 1,400
Nontrade receivables					22,100		22,100
ARKIVE, Inc. Sale | Discontinued Operations, Disposed of by Sale
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Disposal, consideration		$ 50,000
Cash proceeds from divestment		$ 45,000
Australia Divestment Business | Disposed of by Sale, Not Discontinued Operations
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Disposal, consideration											$ 53,200	AUD 70,000
Cash proceeds from divestment | AUD			AUD 35,000
Amount of consideration received | AUD			AUD 35,000
Amount of consideration received, state interest rate											3.30%	3.30%
UK Divestments | Discontinued Operations, Disposed of by Sale
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Disposal, consideration									$ 2,200	£ 1,800
UK Divestments | Discontinued Operations, Held-for-sale
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Disposal Group, Including Discontinued Operation, Revenue						311		311
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, gain on sale of disposal					38,869		38,869
Disposal group, goodwill					3,515		3,515
Disposal group, cumulative translation adjustment					29,100		29,100
Seattle/Atlanta Divestments | Discontinued Operations, Held-for-sale
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Disposal Group, Including Discontinued Operation, Revenue						1,810		1,810
Recall Canadian Divestments | Discontinued Operations, Held-for-sale
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Disposal Group, Including Discontinued Operation, Revenue						$ 1,888		$ 1,888
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		$ 18,000