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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Parenthetical) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Statement of Comprehensive Income [Abstract]        
Amortization of prior service credits, taxes $ 80 $ 80 $ 241 $ 240
Amortization of actuarial losses, taxes (329) (406) (1,035) (1,212)
Unrealized (losses) gains on derivatives, taxes 1,633   5,875  
Unrealized (losses) gains on derivatives, taxes   (442)   (1,351)
Reclassification adjustment for realized losses, taxes $ (267)   $ (907)  
Reclassification adjustment for realized losses, taxes   $ (661)   $ (441)