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Divestments (Details) - USD ($) $ in Thousands		3 Months Ended	6 Months Ended
Divestments (Details) - USD ($) $ in Thousands	Mar. 19, 2019	Mar. 31, 2019	Jun. 30, 2019	Jun. 30, 2018
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Investments in joint ventures			$ 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]
Investments in joint ventures	$ 20,000
Equity interest	34.00%
Equity method investment, fair value	$ 27,500
Carrying value of investment			$ 23,896