CONDENSED CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY (USD $) In Thousands	Total	Common Stock	Paid-in Capital	Retained Earnings	Accumulated Other Comprehensive (Loss) Income	Treasury Stock
Beginning Balance at Dec. 31, 2009	$ 685,762	$ 435	$ 173,176	$ 628,234	$ (55,601)	$ (60,482)
Beginning Balance (in shares) at Dec. 31, 2009		38,284
Comprehensive income:
Net income	63,036			63,036
Changes in net prior service credit and actuarial losses, net of tax provision of ($1,526) in 2011 and ($1,606) in 2010	2,486				2,486
Change in fair value of derivatives, net of tax provision of ($1,074) in 2011 and net of tax benefit of $76 in 2010	(138)				(138)
Foreign currency translation, net of tax benefit of $12,818 in 2011 and net of tax provision of ($10,948) in 2010	(17,334)				(17,334)
Comprehensive income	48,050
Dividends declared on common stock	(16,342)			(16,342)
Stock compensation expense	3,023		3,023
Stock option exercises, including tax benefit of $679 in 2011 and $166 in 2010 (in shares)		15
Stock option exercises, including tax benefit of $679 in 2011 and $166 in 2010	323		323
Net issuance of treasury stock for vested restricted stock units, including tax benefit of $1,700 in 2011 and $330 in 2010 (in shares)		47
Net issuance of treasury stock for vested restricted stock units, including tax benefit of $1,700 in 2011 and $330 in 2010	(872)		(556)			(316)
Two-for-one stock split, net of treasury shares of 5,171 (in shares)		38,332
Two-for-one stock split, net of treasury shares of 5,171		435	(435)
Ending Balance at Jun. 30, 2010	719,944	870	175,531	674,928	(70,587)	(60,798)
Ending Balance (in shares) at Jun. 30, 2010		76,678
Beginning Balance at Dec. 31, 2010	553,599	873	183,524	740,923	(63,026)	(308,695)
Beginning Balance (in shares) at Dec. 31, 2010		69,876
Comprehensive income:
Net income	77,320			77,320
Changes in net prior service credit and actuarial losses, net of tax provision of ($1,526) in 2011 and ($1,606) in 2010	2,479				2,479
Change in fair value of derivatives, net of tax provision of ($1,074) in 2011 and net of tax benefit of $76 in 2010	1,483				1,483
Foreign currency translation, net of tax benefit of $12,818 in 2011 and net of tax provision of ($10,948) in 2010	14,146				14,146
Comprehensive income	95,428
Dividends declared on common stock	(15,600)			(15,600)
Stock compensation expense	4,742		4,742
Stock option exercises, including tax benefit of $679 in 2011 and $166 in 2010 (in shares)		46
Stock option exercises, including tax benefit of $679 in 2011 and $166 in 2010	1,073		1,073
Net issuance of treasury stock for vested restricted stock units, including tax benefit of $1,700 in 2011 and $330 in 2010 (in shares)		216
Net issuance of treasury stock for vested restricted stock units, including tax benefit of $1,700 in 2011 and $330 in 2010	(3,119)		(613)			(2,506)
Ending Balance at Jun. 30, 2011	$ 636,123	$ 873	$ 188,726	$ 802,643	$ (44,918)	$ (311,201)
Ending Balance (in shares) at Jun. 30, 2011		70,138