Leases - Supplemental Cash Flow Information (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Cash paid for amounts included in the measurement of lease liabilities:
Operating cash flows from finance leases	$ 774	$ 546
Financing cash flows from finance leases	8,247	3,833
Non-cash right-of-use assets obtained in exchange for lease obligations:
Finance leases	$ 35,288	$ 2,286