Leases - Supplemental Cash Flow Information (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019
Cash paid for amounts included in the measurement of lease liabilities
Operating cash flows paid for operating leases	$ 4,105	$ 3,816
Operating cash flows paid for interest portion of finance leases	37	36
Financing cash flows paid for principal portion of finance leases	145	106
Right-of-use assets obtained in exchange for lease obligations
Operating leases	299	280
Finance leases	$ 11	$ 517