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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
Issuance of stock to employees under benefit plans, shares withheld for payroll tax $ 10,597 $ 12,018 $ 12,192
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)