Fair Value Measurements - Nonrecurring Basis (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Long-lived assets	$ 166,900	$ 160,740	$ 166,900	$ 160,740
Loss on impairment	46	135,688	146,964	202,121
Impairments of real estate				202,121
Significant Unobservable Inputs (Level 3)
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Long-lived assets	$ 166,900	$ 160,740	$ 166,900	$ 160,740