Dispositions (Details) $ in Thousands		1 Months Ended	3 Months Ended
	Mar. 31, 2020 USD ($) a ft² parking_space	Nov. 30, 2019 USD ($)	Mar. 31, 2021 USD ($)	Mar. 31, 2020 USD ($) parking_space	Dec. 31, 2020 USD ($)
Real Estate [Line Items]
Net investment in lease receivable			$ 2,919		$ 2,926
Gain (loss) on sale or disposal of real estate and other assets, net			0	$ 38,124
Proceeds from the sale of lease receivable			$ 0	$ 64,155
100 Fellowship Drive
Real Estate [Line Items]
Area of land sold (in acres) | a	13.5
Square footage of buildings sold (in sqft) | ft²	203,257
Number of parking spaces | parking_space	550			550
Proceeds from sales of properties	$ 115,000
Sales-type lease, derecognized developments		$ 63,700
Net investment in lease receivable	76,100	75,900		$ 76,100
Selling profit from sales-type leases		$ 13,500
Gain (loss) on sale or disposal of real estate and other assets, net				38,300
Transaction costs on sales of investments real estate	200
Payments to acquire real estate	$ 600
Proceeds from the sale of lease receivable				$ 64,200