Leases - Balance Sheet Information (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Operating Leases
Operating lease right-of-use assets	$ 23,201	$ 23,901
Current portion of operating lease liabilities included in "Other accrued liabilities"	7,645	7,722
Operating lease liabilities	16,005	16,656
Total operating lease liabilities	$ 23,650	$ 24,378
Operating Lease, Liability, Current, Statement of Financial Position [Extensible List]	us-gaap:OtherAccruedLiabilitiesCurrent	us-gaap:OtherAccruedLiabilitiesCurrent
Finance Leases
Property, plant and equipment, at cost	$ 10,352	$ 15,367
Accumulated depreciation	(3,453)	(3,941)
Property, plant and equipment, net	$ 6,899	$ 11,426
Finance Lease, Right-of-Use Asset, Statement of Financial Position [Extensible List]	us-gaap:PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetAfterAccumulatedDepreciationAndAmortization	us-gaap:PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetAfterAccumulatedDepreciationAndAmortization
Current installments of finance lease obligations	$ 3,189	$ 6,758
Finance lease obligations	348	717
Total finance lease obligations	$ 3,537	$ 7,475