XML 17 R4.htm IDEA: XBRL DOCUMENT v3.8.0.1
CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Parenthetical) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Statement of Comprehensive Income [Abstract]        
Amortization of prior service credits, taxes $ 129 $ 130 $ 388 $ 389
Amortization of actuarial losses, taxes (392) (520) (1,747) (1,551)
Unrealized gains on derivatives, taxes 1,045 1,663 2,693 (658)
Reclassification adjustment for realized (gains) losses, taxes $ 67 $ (154) $ (1,531) $ (494)