Leases - Supplemental Balance Sheets Information (Details) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019	Jun. 30, 2019
Leases [Abstract]
Operating lease right-of-use assets	$ 19,616	$ 21,056	$ 22,685
Property, plant and equipment, net	6,088	6,412
Lease right-of-use assets	25,704	27,468
Current operating lease liabilities	3,681	3,750	3,824
Current portion of long-term debt	2,414	2,424
Long-term operating lease liabilities	16,502	18,247	$ 19,656
Long-term debt	3,871	4,161
Total lease liabilities	26,468	28,582
Operating lease, accumulated amortization	9,900	8,500
Finance lease, accumulated amortization	$ 4,900	$ 4,700