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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
Issuance of stock to employees under benefit plans, shares withheld for payroll tax $ 9,808 $ 10,597 $ 12,018
Unrealized (losses) gains on marketable securities arising during period, tax 923 (1,667) 1,449
Reclassification adjustment for gains included in net income, tax (255) (390) (645)
Amortization of prior service (credit) cost included in net periodic pension and post-retirement expense/income, tax (190) (169) (169)
Prior service income arising during period, tax $ 34 $ 0 $ 0