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Supplemental Financial Information (Components of Interest Expense (Net)) (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Supplemental Income Statement Elements [Abstract] |  |  |
Interest on revolving credit facility | $ 3,294 | $ 7,378 | $ 6,304
Interest rate swap settlements | 3,191 | (200) | (247)
Line of credit fees | 715 | 576 | 573
Debt issuance amortization costs | 593 | 552 | 552
Interest on finance leases | 134 | 127 | 172
Interest income | (939) | (1,610) | (804)
Other | 147 | 46 | 79
Total interest expense, net | $ 7,135 | $ 6,869 | $ 6,629

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