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Supplemental Financial Information - Components of Interest Expense (Net) (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Supplemental Income Statement Elements [Abstract] |  |  |
Interest on revolving credit facility | $ 7,378 | $ 6,304 | $ 5,115
Interest rate swap settlements | (200) | (247) | 51
Line of credit fees | 576 | 573 | 555
Debt issuance amortization costs | 552 | 552 | 549
Interest on finance leases | 127 | 172 | 169
Interest income | (1,610) | (804) | (379)
Other | 46 | 79 | 71
Total interest expense, net | $ 6,869 | $ 6,629 | $ 6,131

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