CONDENSED CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY (Parenthetical) $ in Thousands	9 Months Ended
	Sep. 30, 2015 USD ($) $ / shares shares
Statement of Stockholders' Equity [Abstract]
Pension and other postretirement adjustments, tax	$ 1,187
Amortization of forward starting swaps, tax	$ 1,917
Issuance of common stock from issuance of unvested shares, exercise of stock options and deferred compensation plans (in shares) | shares	557,026
Repurchase of common stock (in shares) | shares	2,401,729
Cash dividends declared, per common share outstanding | $ / shares	$ 0.96