Summary of Significant Accounting Policies (Details)	3 Months Ended	9 Months Ended
	Sep. 30, 2020 USD ($)	Sep. 30, 2020 USD ($) engine	Sep. 30, 2019 USD ($)
Property, Plant and Equipment [Line Items]
Asset write-down		$ 14,400,000	$ 11,300,000
Number of assets impaired | engine		2
Contingencies related to COVID-19
Property, Plant and Equipment [Line Items]
Percentage of workforce furloughed or subject to reduced compensation, COVID-19	13.00%	13.00%
Asset write-down	$ 0	$ 500,000
Number of assets impaired | engine		2
Reduction to revenue, rent concessions	$ 2,100,000	$ 5,200,000