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Condensed Consolidated Statements of Stockholders' Equity (Unaudited) (Parentheticals) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
AOCI Attributable to Parent [Member]    
Unrealized gain (loss) on interest rate swaps, tax $ 5,065 $ (5,341)