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	Comprehensive Income (Loss)
Balance at Dec. 31, 2008	$ 1,009,973	$ 9,858	$ 150,609	$ 1,236,810	$ (218,254)	$ (183,807)	$ 14,757
Balance (in shares) at Dec. 31, 2008		85,044,000
Comprehensive income:
Net income	48,833			48,576			257	48,833
Unrecognized amounts from defined benefit pension plans, net of tax of $47,413, $893 and $12,242 during the year 2011, 2010 and 2009, respectively	21,287				20,835		452	21,287
Unrealized gain on derivatives designated and qualifying as cash flow hedges, net of tax of $264, $302 and $1,477 during the year 2011, 2010 and 2009, respectively	1,444				1,444			1,444
Currency translation adjustment	47,230				46,571		659	47,230
Total comprehensive income (loss)	118,794							118,794
Cash dividends declared - $0.635, $0.575 and $0.545 per share during the year 2011, 2010 and 2009, respectively	(46,382)			(46,382)
Issuance of shares under benefit plans	6,429		3,902			2,527
Issuance of shares under benefit plans (in shares)		246,000
Purchase of noncontrolling interest shares	(2,796)						(2,796)
Purchase of shares for treasury	(343)					(343)
Purchase of shares for treasury (in shares)		(16,000)
Balance at Dec. 31, 2009	1,085,675	9,858	154,511	1,239,004	(149,404)	(181,623)	13,329
Balance (in shares) at Dec. 31, 2009		85,274,000
Comprehensive income:
Net income	132,210			130,244			1,966	132,210
Unrecognized amounts from defined benefit pension plans, net of tax of $47,413, $893 and $12,242 during the year 2011, 2010 and 2009, respectively	(2,024)				(2,024)			(2,024)
Unrealized gain on derivatives designated and qualifying as cash flow hedges, net of tax of $264, $302 and $1,477 during the year 2011, 2010 and 2009, respectively	292				292			292
Currency translation adjustment	9,874				9,188		686	9,874
Total comprehensive income (loss)	140,352							140,352
Cash dividends declared - $0.635, $0.575 and $0.545 per share during the year 2011, 2010 and 2009, 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)
Balance at Dec. 31, 2010	1,149,478	9,858	162,447	1,320,552	(141,948)	(217,412)	15,981
Balance (in shares) at Dec. 31, 2010	84,241,600	84,242,000
Comprehensive income:
Net income	217,013			217,186			(173)	217,013
Unrecognized amounts from defined benefit pension plans, net of tax of $47,413, $893 and $12,242 during the year 2011, 2010 and 2009, respectively	(79,936)				(79,936)			(79,936)
Unrealized gain on derivatives designated and qualifying as cash flow hedges, net of tax of $264, $302 and $1,477 during the year 2011, 2010 and 2009, respectively	1,264				1,264			1,264
Currency translation adjustment	(26,773)				(27,261)		488	(26,773)
Total comprehensive income (loss)	111,568							111,568
Cash dividends declared - $0.635, $0.575 and $0.545 per share during the year 2011, 2010 and 2009, 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)
Balance at Dec. 31, 2011	$ 1,193,242	$ 9,858	$ 179,104	$ 1,484,393	$ (247,881)	$ (248,528)	$ 16,296
Balance (in shares) at Dec. 31, 2011	83,757,366	83,757,000