Investments in Unconsolidated Entity (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Investments in Unconsolidated Joint Ventures
Assets	$ 3,898,572	$ 3,223,533
Debt outstanding	1,842,337
Equity Method Investment, Nonconsolidated Investee or Group of Investees
Investments in Unconsolidated Joint Ventures
Assets	141,500	127,800
Debt outstanding	$ 90,100	68,200
Joint venture with Alinda
Investments in Unconsolidated Joint Ventures
Lease term of facility with global cloud-based software company	10 years
Equity method investments	$ 22,600	$ 30,200
Ownership interest (as a percent)	50.00%