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Consolidated Statements of Comprehensive Income (Parenthetical) (Unaudited) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Statement of Comprehensive Income [Abstract]        
Tax effect of change in unrealized gains and losses on interest rate swaps $ 413 $ (185) $ 503 $ (459)