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Supplemental Financial Information (Interest Expense) (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020
Supplemental Income Statement Elements [Abstract] |  |  |  |
Interest on revolving credit facility | $ 5 | $ 1,388 | $ 106 | $ 2,467
Interest rate swap settlements | 0 | 336 | 0 | 422
Line of credit fees | 291 | 152 | 564 | 318
Debt issuance amortization costs | 179 | 138 | 358 | 276
Interest on finance leases | 47 | 32 | 259 | 65
Interest income | (150) | (269) | (345) | (589)
Other | 32 | 2 | 69 | 27
Total interest expense, net | $ 404 | $ 1,779 | $ 1,011 | $ 2,986

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- Definition Amount of interest expense on finance lease liability. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=123408670&loc=SL77918686-209980 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 45 -Paragraph 4 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=123391704&loc=SL77918638-209977 Reference 3: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 55 -Paragraph 53 -URI http://asc.fasb.org/extlink&oid=123414884&loc=SL77918982-209971 + Details
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