CONSOLIDATED STATEMENTS OF EQUITY (USD $) In Thousands, except Share data, unless otherwise specified	Total	Common Stock	Additional Paid-In Capital	Retained Earnings	Accumulated Other Comprehensive Income (Loss) [Member]	Treasury Shares	Noncontrolling Interests
Beginning Balance at Dec. 31, 2011	$ 1,193,242	$ 9,858	$ 179,104	$ 1,484,393	$ (247,881)	$ (248,528)	$ 16,296
Beginning Balance (in shares) at Dec. 31, 2011		83,757,000
Increase (Decrease) in Stockholders' Equity
Net income	257,216			257,411			(195)
Unrecognized amounts from defined benefit pension plans, net of tax	(6,475)				(6,475)
Unrealized gain on derivatives designated and qualifying as cash flow hedges, net of tax	(832)				(832)
Currency translation adjustment	19,635				19,788		(153)
Cash dividends declared - $0.98, $0.83, and $0.710 per share during the year 2014, 2013 and 2012, respectively	(59,136)			(59,136)
Issuance of shares under benefit plans	35,689		26,020			9,669
Issuance of shares under benefit plans (in shares)		985,000
Purchase of shares for treasury	(81,018)					(81,018)
Purchase of shares for treasury (in shares)		(1,797,000)
Ending Balance at Dec. 31, 2012	1,358,321	9,858	205,124	1,682,668	(235,400)	(319,877)	15,948
Ending Balance (in shares) at Dec. 31, 2012		82,945,000
Increase (Decrease) in Stockholders' Equity
Net income	291,687			293,780			(2,093)
Unrecognized amounts from defined benefit pension plans, net of tax	101,151				101,151
Unrealized gain on derivatives designated and qualifying as cash flow hedges, net of tax	289				289
Currency translation adjustment	(19,955)				(18,136)		(1,819)
Cash dividends declared - $0.98, $0.83, and $0.710 per share during the year 2014, 2013 and 2012, respectively	(67,986)			(67,986)
Issuance of shares under benefit plans	41,153		33,693			7,460
Issuance of shares under benefit plans (in shares)		787,000
Purchase of shares for treasury	(167,879)					(167,879)
Purchase of shares for treasury (in shares)		(2,722,000)
Equity (Increase) Decrease from Transactions with Noncontrolling Interest Holders	(6,093)		1,702		155		(7,950)
Ending Balance at Dec. 31, 2013	1,530,688	9,858	240,519	1,908,462	(151,941)	(480,296)	4,086
Ending Balance (in shares) at Dec. 31, 2013	81,010,084	81,010,000
Increase (Decrease) in Stockholders' Equity
Net income	253,880			254,686			(806)
Unrecognized amounts from defined benefit pension plans, net of tax	(37,200)				(37,200)
Unrealized gain on derivatives designated and qualifying as cash flow hedges, net of tax	(378)				(378)
Currency translation adjustment	(98,365)				(99,099)		734
Cash dividends declared - $0.98, $0.83, and $0.710 per share during the year 2014, 2013 and 2012, respectively	(76,974)			(76,974)
Issuance of shares under benefit plans	23,578		19,781			3,797
Issuance of shares under benefit plans (in shares)		385,000
Purchase of shares for treasury	(307,178)					(307,178)
Purchase of shares for treasury (in shares)	(4,398,063)	(4,398,000)
Equity (Increase) Decrease from Transactions with Noncontrolling Interest Holders	(2,270)		(1,484)		(4)		(782)
Ending Balance at Dec. 31, 2014	$ 1,285,781	$ 9,858	$ 258,816	$ 2,086,174	$ (288,622)	$ (783,677)	$ 3,232
Ending Balance (in shares) at Dec. 31, 2014	76,997,161	76,997,000