Annual report pursuant to Section 13 and 15(d)

CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Parenthetical)

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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
CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME      
Adjustment for pension and postretirement benefit liability, tax $ (140) $ 147 $ (495)
Adjustment for interest rate swap, tax $ 88 $ 225 $ 564