Commitments and Contingencies - Lease Cost (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Operating Lease Costs
Operating lease costs before capitalized operating lease costs	$ 7,567	$ 8,113
Operating lease costs capitalized	(828)	(746)
Operating lease costs, net	6,739	7,367
Finance Lease, Costs [Abstract]
Interest on financing leases	1,492	1,663
Interest on financing leases capitalized	0	(747)
Interest on financing leases, net	1,492	916
Finance lease, right-of-use asset, amortization	180	305
Financing lease costs, net	$ 1,672	$ 1,221
Operating lease, weighted average discount rate, percent	4.52%
Operating lease, weighted average remaining lease term	27 years