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Consolidated Statements of Stockholders' Equity (Parentheticals) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
AOCI Attributable to Parent [Member]      
Unrealized gain (loss) on interest rate swaps, tax $ 6,933 $ (4,826) $ (4,877)