Lease Agreements - Supplemental cash flow information related to leases (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 for operating leases	$ (7,940)	$ (8,633)
Operating cash for finance leases	(405)	(424)
Financing cash flows for finance leases	(637)	(611)
Lease obligations obtained in exchange for right-of-use assets:
Operating leases	$ 5,092	$ 1,713