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CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE INCOME (UNAUDITED) (Parenthetical) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Income Statement [Abstract]        
Net unrealized (losses) gains in accumulated other comprehensive income, tax (benefit) expense $ (2,879) $ 1,388 $ (3,304) $ 2,703
Reclassification adjustment for realized losses included in net income, tax expense $ 12 $ 66 $ 10 $ 45