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Consolidated Statements of Comprehensive Income (Parentheticals) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Adjustment For Actuarially Determined Liabilities        
Other comprehensive income, tax expense $ (14) $ (687) $ (29) $ (781)