Summary of Significant Accounting Policies - Leases - Lease Expenses (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2020 USD ($)
Components of leases expenses:
Operating lease cost	$ 9,506
Amortization of right-of-use asset	3,419
Interest on lease liabilities	785
Total finance lease cost	4,204
Short-term lease cost	298
Variable lease cost	2,656
Total lease cost	16,664
Sublease income	(258)
Net lease cost	$ 16,406