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Supplemental Financial Information - Interest Expense (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019
Supplemental Income Statement Elements [Abstract] |  |  |  |
Interest on revolving credit facility | $ 1,388 | $ 2,179 | $ 2,467 | $ 4,430
Interest rate swap settlements | 336 | (79) | 422 | (201)
Line of credit fees | 152 | 127 | 318 | 253
Debt issuance amortization costs | 138 | 138 | 276 | 276
Interest on finance leases | 32 | 31 | 65 | 63
Interest income | (269) | (375) | (589) | (864)
Other | 2 | 17 | 27 | 19
Total interest expense, net | $ 1,779 | $ 2,038 | $ 2,986 | $ 3,976

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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=121609121&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=121603541&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=121568110&loc=SL77918982-209971 + Details
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