Real Estate Finance Lease Liability, Maturity - Platform 16 (Details) - USD ($) $ in Thousands		Mar. 31, 2019	Jan. 24, 2019	Dec. 31, 2018
Real estate
2019		$ 4,401
2020	[1]	122,070
Total expected minimum lease payments		203,907
Interest portion		(30,784)
Present value of expected net lease payments		$ 173,123		$ 0
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] (1)Finance lease payments in 2020 and 2024 include approximately $119.8 million and $38.7 million, respectively, related to purchase options that the Company is reasonably certain that it will exercise.