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Consolidated Statements of Stockholders' Equity (Parentheticals) - AOCI Attributable to Parent [Member] - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Unrealized gain (loss) on interest rate swaps, tax | $ 4,877 | $ 1,027 | $ 2,384
Pension liability adjustment, tax |  | $ 154 | $ 21

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