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Consolidated Statements of Comprehensive Income (Parenthetical) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Statement of Comprehensive Income [Abstract]      
Changes in benefit obligations and plan assets for defined benefit and postretirement benefit plans, deferred income taxes $ (1) $ 0 $ 0
Unrealized gain (loss) on available for sale securities, deferred income taxes 147 (554) (234)
Change in fair value of interest rate swap, deferred income taxes $ 0 $ 0 $ 99