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Condensed Consolidated Statements of Stockholders' Equity (Unaudited) (Parentheticals) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
AOCI Attributable to Parent [Member]        
Unrealized gain (loss) on interest rate swaps, tax $ (956) $ 571 $ (5,234) $ 3,654