Lessor Operating Leases (Details) $ in Thousands, ft² in Millions	3 Months Ended	9 Months Ended
	Sep. 30, 2019 USD ($) ft²	Sep. 30, 2019 USD ($) ft²	Sep. 30, 2018 USD ($)
Lessor, Lease, Description [Line Items]
Gross leasable area (GLA) of industrial properties | ft²	62.7	62.7
Future Minimum Cash Receipts, Remainder of 2019	$ 81,674	$ 81,674
Future Minimum Cash Receipts, 2020	$ 324,063	$ 324,063
Sales Type Lease
Lessor, Lease, Description [Line Items]
Gross leasable area (GLA) of industrial properties | ft²	0.6	0.6
Sales-type Lease, Selling Profit (Loss)	$ 8,606	$ 8,606	$ 0
Lease Receivable	54,521	54,521	$ 0
Future Minimum Cash Receipts, Remainder of 2019	851	851
Future Minimum Cash Receipts, 2020	$ 56,830	$ 56,830