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Divestments - (Details) - USD ($) $ in Thousands		3 Months Ended
Divestments - (Details) - USD ($) $ in Thousands	Mar. 19, 2019	Mar. 31, 2019	Mar. 31, 2018
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Payments to Acquire Interest in Joint Venture		$ 19,222	$ 0
Consumer Storage \| Disposal Group, Not Discontinued Operations
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Gain on disposal		4,200
Corporate Joint Venture \| Makespace
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Payments to Acquire Interest in Joint Venture	$ 20,000
Equity method investment, ownership percentage	34.00%
Equity method investment, fair value		$ 27,500