Leases - Operating Lease Expense, Operating Lease Cash Flows and Supplemental Cash Flow Information (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Lessee, Lease, Description [Line Items]
Operating lease expense	$ 1,489	$ 1,610	$ 4,279	$ 4,951
Operating cash outflows from operating leases	1,617	1,537	4,685	5,197
Operating lease right-of-use assets obtained in exchange for lease obligations	1,935	1,131	2,121	2,655
Cost of sales
Lessee, Lease, Description [Line Items]
Operating lease expense	513	574	1,285	1,627
Selling, general and administrative expenses
Lessee, Lease, Description [Line Items]
Operating lease expense	$ 976	$ 1,036	$ 2,994	$ 3,324