CONDENSED CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY (Parenthetical) $ in Thousands	3 Months Ended
	Mar. 31, 2017 USD ($) shares
Statement of Stockholders' Equity [Abstract]
Pension and other postretirement adjustments, tax	$ 552
Amortization of forward starting swaps, tax	$ 635
Issuance of common stock from performance share units and exercise of stock options (in shares) | shares	205,965
Issuance of common stock from exercise of stock options and deferred compensation plans, tax amount	$ 4,221
Repurchase of common stock (in shares) | shares	82,000