Leases - Facility Lease Expense (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Leases, Operating [Abstract]
Cash basis payment - operating leases		$ 324,870	$ 365,077
Straight-line lease (income) expense		(17,218)	(20,990)
Amortization of deferred gain	$ 0	(4,358)	(4,366)
Facility lease expense		$ 303,294	$ 339,721