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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Parenthetical) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Foreign currency translation adjustment, tax $ 0    
Unrealized (losses) gains on marketable securities arising during period, tax (1,667) $ 1,449 $ (216)
Amounts reclassified from accumulated other comprehensive income, tax (390) (645) (257)
Amortization of prior service (credit) cost included in net periodic pension and post-retirement expense/income, tax $ (169) $ (169) $ (159)