Summary of Significant Accounting Policies - Leases - Supplemental Cash Flow Information (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2020 USD ($)
Leases
Operating cash flows from operating leases	$ 12,268
Operating cash flows from finance leases	5,401
Financing cash flows from finance leases	785
Right-of-use asset obtained in exchange for new lease obligation, operating leases	1,677
Right-of-use asset obtained in exchange for new lease obligation, finance leases	$ 3,599