Real Estate Finance Lease Liability, Maturity - Platform 16 (Details) - USD ($) $ in Thousands		Sep. 30, 2019	Jul. 19, 2019	Jul. 16, 2019	Jan. 24, 2019
Real estate
2019		$ 150
2020		907
2021		5,958
2022		10,208
2023		9,708
Thereafter	[1]	1,431,760
Total expected minimum lease payments		1,458,691
Interest portion		(1,237,662)
Present value of expected net lease payments		$ 221,029
2100 Pennsylvania Avenue [Member]
Real estate
2019			$ 0
2020			0
2021			3,863
2022			8,576
2023			8,669
Thereafter			1,358,518
Total expected minimum lease payments			1,379,626
Interest portion			(1,214,649)
Present value of expected net lease payments			$ 164,977	$ 165,000
Platform 16 [Member]
Real estate
2019					$ 17,918
2020					109,460
Total expected minimum lease payments					127,378
Interest portion					(4,815)
Present value of expected net lease payments					$ 122,563

[1] Finance lease payments in 2024 include approximately $38.7 million related to a purchase option that the Company is reasonably certain it will exercise.