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Leases (Assets and Liabilities Balance Related to Finance and Operating Leases) (Details) - USD ($) $ in Thousands | Jun. 30, 2021 | Dec. 31, 2020
--- | --- | ---
Leases [Abstract] |  |
Finance lease right-of-use assets | $ 418 | $ 7,017
Operating lease right-of-use assets | 4,565 | 4,216
Finance lease obligations, current portion | 219 | 4,755
Finance lease obligations, non-current portion | 161 | 322
Total finance lease obligations | 380 | 5,077
Operating lease obligations, current portion | 2,164 | 2,275
Operating lease obligations, non-current portion | 2,431 | 2,219
Total operating lease obligations | $ 4,595 | $ 4,494
Finance Lease, Right-of-Use Asset, Statement of Financial Position [Extensible List] | Property, plant and equipment, net of accumulated depreciation of $363,927 and $365,844 | Property, plant and equipment, net of accumulated depreciation of $363,927 and $365,844
Operating Lease, Right-of-Use Asset, Statement of Financial Position [Extensible List] | Other long-term assets | Other long-term assets
Finance Lease, Liability, Current, Statement of Financial Position [Extensible List] | Other accrued liabilities | Other accrued liabilities
Finance Lease, Liability, Noncurrent, Statement of Financial Position [Extensible List] | Other long-term liabilities | Other long-term liabilities
Operating Lease, Liability, Current, Statement of Financial Position [Extensible List] | Other accrued liabilities | Other accrued liabilities
Operating Lease, Liability, Noncurrent, Statement of Financial Position [Extensible List] | Other long-term liabilities | Other long-term liabilities

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- Definition Present value of lessee's discounted obligation for lease payments from finance lease. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=123408670&loc=SL77918701-209980 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 45 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=123391704&loc=SL77918627-209977 + Details
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- Definition Amount, after accumulated amortization, of right-of-use asset from finance lease. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 45 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=123391704&loc=SL77918627-209977 + Details
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