Leases - Operating Lease Expense, Operating Lease Cash Flows and Supplemental Cash Flow Information (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Lessee, Lease, Description [Line Items]
Operating lease expense	$ 1,402	$ 1,768	$ 2,790	$ 3,492
Operating cash outflows from operating leases	1,543	1,579	3,068	3,094
Operating lease right-of-use assets obtained in exchange for lease obligations	0	0	186	1,524
Cost of sales
Lessee, Lease, Description [Line Items]
Operating lease expense	382	612	772	1,204
Selling, general and administrative expenses
Lessee, Lease, Description [Line Items]
Operating lease expense	$ 1,020	$ 1,156	$ 2,018	$ 2,288