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Investments in Unconsolidated Joint Ventures (Kings Hill Unit Trust) (Details) ft² in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2018 USD ($) ft² bldg	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)
Schedule of Equity Method Investments [Line Items]
Number of buildings (in buildings) \| bldg	60
Management fee income	$ 73,224	$ 82,673	$ 12,941
United Kingdom \| Kings Hill Unit Trust
Schedule of Equity Method Investments [Line Items]
Ownership percentage	20.00%
United Kingdom \| Kings Hill Unit Trust \| Equity Method Investee
Schedule of Equity Method Investments [Line Items]
Note receivable interest rate	10.00%
Management fee income	$ 349	302	$ 293
United Kingdom \| Building and Building Improvements \| Kings Hill Unit Trust
Schedule of Equity Method Investments [Line Items]
Leaseable square feet (in sqft) \| ft²	489
United Kingdom \| Building and Building Improvements \| Office properties \| Kings Hill Unit Trust
Schedule of Equity Method Investments [Line Items]
Number of buildings (in buildings) \| bldg	14
Investments in and advances to unconsolidated joint ventures \| United Kingdom \| Kings Hill Unit Trust \| Equity Method Investee
Schedule of Equity Method Investments [Line Items]
Notes receivable	$ 4,900	4,700
Prepaid Expenses and Other Current Assets \| United Kingdom \| Kings Hill Unit Trust \| Equity Method Investee
Schedule of Equity Method Investments [Line Items]
Due from related parties	$ 15	$ 122