Commitments and Contingencies - Lease Cost (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Operating Lease Costs
Operating lease costs before capitalized operating lease costs	$ 7,751	$ 8,315	$ 24,486	$ 24,918
Operating lease costs capitalized	(778)	(20)	(2,315)	(27)
Operating Lease, Cost	6,973	8,295	22,171	24,891
Finance Lease, Costs [Abstract]
Interest on financing leases before capitalized interest	2,198	813	6,010	2,425
Interest on financing leases capitalized	(588)	0	(2,378)	0
Interest on financing leases, net	1,610	813	3,632	2,425
Amortization of right-of-use assets	304	304	914	914
Financing lease costs, net	$ 1,914	$ 1,117	$ 4,546	$ 3,339