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Condensed Consolidated Statements of Stockholders' Equity (Unaudited) (Parentheticals) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
AOCI Attributable to Parent [Member]        
Unrealized gain (loss) on interest rate swaps, tax $ 1,215 $ 2,478 $ 6,556 $ 4,278