Leases Lease Costs (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Finance lease cost
Amortization of leased assets	$ 169	$ 135	$ 439	$ 863
Interest of lease liabilities	29	302	167	641
Operating lease cost
Operating lease cost	51,122	39,590	149,345	137,943
Short-term lease cost	7,181	4,218	20,779	11,176
Variable lease cost	32,895	29,260	88,278	89,030
Total lease cost	$ 91,396	$ 73,505	$ 259,008	$ 239,653