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Consolidated Statements Of Shareholders' Equity (Parenthetical) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Statement of Stockholders' Equity [Abstract]      
Foreign currency translation adjustment, tax (benefit) $ (890) $ (2,396) $ 233
Derivative financial instruments adjustment, tax (benefit) (550) (112) (133)
Net gains or losses and prior service costs, tax (benefit) (226) (22,445) 13,231
Amortization of prior service costs and net gains or losses, tax $ 5,823 $ 3,582 $ 5,398
Cash dividends declared (in usd per share) $ 0.42 $ 0.34 $ 0.28
Issued upon exercise of stock options, income tax (benefit) $ 302 $ (3) $ (188)