Consolidated Statements of Shareholders' Equity (Parenthetical) - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Accumulated other comprehensive income (loss)
Tax effect on employee benefit funded status adjustment	$ (122)	$ (1,381)	$ (3,826)
Reinvested earnings
Cash dividends (in dollars per share)	$ 0.78	$ 0.6	$ 0.7
Capital in excess of par value
Issuance of treasury stock (in shares)	35	30	35