CONDENSED CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY (Parenthetical) $ in Thousands	9 Months Ended
	Sep. 30, 2016 USD ($) $ / shares shares
Statement of Stockholders' Equity [Abstract]
Pension and other postretirement adjustments, tax | $	$ 964
Amortization of forward starting swaps, tax | $	$ 1,872
Issuance of common stock from performance share units and exercise of stock options (in shares) | shares	447,378
Repurchase of common stock (in shares) | shares	738,953
Cash dividends declared (in dollars per share) | $ / shares	$ 1.02