CONDENSED CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY - 6 months ended Jun. 30, 2015 - USD ($) $ in Thousands	Total	Common Stock and Additional Paid-In Capital	Retained Earnings	Cumulative Translation Adjustment	Retirement Benefits Adjustment	Cumulative Unrealized Gain (Loss) on Derivatives	Treasury Stock
Balance at Dec. 31, 2014	$ 1,486,451	$ 648,451	$ 1,483,821	$ (24,813)	$ (40,316)	$ (27,149)	$ (553,543)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	135,539		135,539
Cumulative translation adjustment	(32,894)			(32,894)
Pension and other postretirement adjustments (net of tax of $790)	1,600				1,600
Amortization of forward starting swaps (net of tax of $1,283)	2,256					2,256
Issuance of 493,943 shares of common stock from issuance of unvested shares, exercise of stock options and deferred compensation plans	13,500	9,178					4,322
Excess tax benefit from share-based compensation	4,083	4,083
Repurchase of 1,490,582 shares of common stock	(113,263)						(113,263)
Shares surrendered for tax withholding	(3,202)						(3,202)
Share-based compensation	10,372	10,372
Cash dividends declared - $0.32 per common share	(49,634)		(49,634)
Balance at Jun. 30, 2015	$ 1,454,808	$ 672,084	$ 1,569,726	$ (57,707)	$ (38,716)	$ (24,893)	$ (665,686)