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Consolidated Statements Of Shareholders' Equity (Parenthetical) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Statement of Stockholders' Equity [Abstract]      
Foreign currency translation adjustment, tax (benefit) $ (729) $ (890) $ (2,396)
Derivative financial instruments adjustment, tax (benefit) 727 (550) (112)
Net gains or losses and prior service costs, tax (benefit) (1,874) (226) (22,445)
Amortization of prior service costs and net gains or losses, tax $ 4,398 $ 5,823 $ 3,582
Cash dividends declared (in usd per share) $ 0.44 $ 0.42 $ 0.34
Issued upon exercise of stock options, income (tax) benefit $ 1,109 $ 302 $ (3)