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CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Parenthetical) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Statement Of Other Comprehensive Income [Abstract]        
Tax expense (benefit) for unrealized gain on derivatives $ (30) $ (41) $ (19) $ 171