Segment Reporting - Total Income and Long-lived Assets by Geography (Details) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020 USD ($)	Sep. 30, 2019 USD ($)	Sep. 30, 2020 USD ($) property	Sep. 30, 2019 USD ($)	Dec. 31, 2019 USD ($)
Segment Reporting Information [Line Items]
Total income by geography	$ 96,782	$ 117,984	$ 252,662	$ 437,976
Long-lived assets by geography	1,219,199		$ 1,219,199		$ 1,597,558
Number of real estate properties | property			11
United States
Segment Reporting Information [Line Items]
Total income by geography	90,814	105,826	$ 222,547	400,864
Long-lived assets by geography	931,300		931,300		1,282,189
Europe
Segment Reporting Information [Line Items]
Total income by geography	5,968	12,161	30,115	37,080
Long-lived assets by geography	287,899		287,899		$ 315,369
Other
Segment Reporting Information [Line Items]
Total income by geography	$ 0	$ (3)	$ 0	$ 32