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)	Treasury Shares	Noncontrolling Interests
Beginning Balance at Dec. 31, 2009	$ 1,085,675	$ 9,858	$ 154,511	$ 1,239,004	$ (149,404)	$ (181,623)	$ 13,329
Beginning Balance (in shares) at Dec. 31, 2009		85,274,000
Increase (Decrease) in Stockholders' Equity
Net income	132,210			130,244			1,966
Unrecognized amounts from defined benefit pension plans, net of tax	(2,024)				(2,024)
Unrealized gain on derivatives designated and qualifying as cash flow hedges, net of tax	292				292
Currency translation adjustment	9,874				9,188		686
Cash dividends declared - $0.710, $0.635, and $0.575 per share during the year 2012, 2011 and 2010, respectively	(48,696)			(48,696)
Issuance of shares under benefit plans	11,829		7,936			3,893
Issuance of shares under benefit plans (in shares)		374,000
Purchase of shares for treasury	(39,682)					(39,682)
Purchase of shares for treasury (in shares)		(1,406,000)
Ending Balance at Dec. 31, 2010	1,149,478	9,858	162,447	1,320,552	(141,948)	(217,412)	15,981
Ending Balance (in shares) at Dec. 31, 2010		84,242,000
Increase (Decrease) in Stockholders' Equity
Net income	217,013			217,186			(173)
Unrecognized amounts from defined benefit pension plans, net of tax	(79,936)				(79,936)
Unrealized gain on derivatives designated and qualifying as cash flow hedges, net of tax	1,264				1,264
Currency translation adjustment	(26,773)				(27,261)		488
Cash dividends declared - $0.710, $0.635, and $0.575 per share during the year 2012, 2011 and 2010, respectively	(53,345)			(53,345)
Issuance of shares under benefit plans	22,538		16,657			5,881
Issuance of shares under benefit plans (in shares)		593,000
Purchase of shares for treasury	(36,997)					(36,997)
Purchase of shares for treasury (in shares)		(1,078,000)
Ending Balance at Dec. 31, 2011	1,193,242	9,858	179,104	1,484,393	(247,881)	(248,528)	16,296
Ending Balance (in shares) at Dec. 31, 2011	83,757,366	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 - $0.710, $0.635, and $0.575 per share during the year 2012, 2011 and 2010, 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	82,944,817	82,945,000