Leases - Supplemental Cash Flow Information (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Cash paid for amounts included in the measurement of lease liabilities
Operating cash flows used in finance leases	$ 192	$ 226
Operating cash flows used in operating leases	13,498	14,090
Financing cash flows used in finance leases	2,018	3,156
Right-of-use assets obtained in exchange for new finance lease liabilities	728	5,250
Right-of-use assets obtained in exchange for new operating lease liabilities	$ 8,682	$ 8,457