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Consolidated Statements of Comprehensive Income (Parenthetical) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Statement of Comprehensive Income [Abstract]      
Changes in benefit obligations and plan assets for defined benefit and postretirement benefit plans, deferred income taxes $ 0 $ 0 $ (3)
Unrealized gain (loss) on available for sale securities, deferred income taxes (554) (234) 473
Change in fair value of interest rate swap, deferred income taxes $ 0 $ 99 $ 49