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CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) (Parenthetical) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Statement Of Other Comprehensive Income [Abstract]        
Tax expense (benefit) for unrealized gain (loss) on derivatives $ 47 $ (74) $ 218 $ 93