Consolidated Statements Of Equity (USD $) In Thousands, unless otherwise specified		Total	Common Stock	Capital Surplus	Accumulated Other Comprehensive (Loss) Income		Retained Earnings	Treasury Stock	Noncontrolling Interests
Balance at Dec. 31, 2011		$ 1,245,131	$ 681	$ 417,136	$ (78,649)	[1]	$ 910,042	$ (14,476)	$ 10,397
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income including noncontrolling interests		148,886					146,584		2,302
Other comprehensive income (loss)		(2,391)			(2,391)	[1]
Common stock issued under share-based compensation plans	[2]	15,823	8	13,242				2,573
Common stock issued under employee stock purchase plan		2,549		2,549
Common stock dividends		(34,073)					(34,387)
Common stock dividends, accrued dividend shares				314
Repurchase of common stock		(23,912)	(9)	(23,903)
Distributions to noncontrolling interests		(1,600)							(1,600)
Share-based compensation expense		6,766		6,766
Balance at Dec. 31, 2012		1,357,179	680	416,104	(81,040)	[1]	1,022,239	(11,903)	11,099
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income including noncontrolling interests		127,354					123,792		3,562
Other comprehensive income (loss)		15,263			15,263	[1]
Common stock issued under share-based compensation plans	[2]	9,483	3	8,167				1,313
Common stock issued under employee stock purchase plan		2,854		2,854
Common stock dividends		(12,080)					(12,158)
Common stock dividends, accrued dividend shares				78
Repurchase of common stock		(26,070)	(7)	(26,063)
Distributions to noncontrolling interests		(1,300)							(1,300)
Share-based compensation expense		6,943		6,943
Balance at Dec. 31, 2013		1,479,626	676	408,083	(65,777)	[1]	1,133,873	(10,590)	13,361
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income including noncontrolling interests		173,427					168,664		4,763
Other comprehensive income (loss)		(17,420)			(17,420)	[1]
Common stock issued under share-based compensation plans	[2]	14,089	8	13,793				288
Common stock issued under employee stock purchase plan		3,615		3,615
Common stock dividends		(21,293)					(21,546)
Common stock dividends, accrued dividend shares				253
Repurchase of common stock		(206,028)	(48)	(205,980)
Distributions to noncontrolling interests		(4,750)							(4,750)
Share-based compensation expense		8,121		8,121
Balance at Dec. 31, 2014		$ 1,429,387	$ 636	$ 227,885	$ (83,197)	[1]	$ 1,280,991	$ (10,302)	$ 13,374

[1] As of December 31, 2014, represents cumulative foreign currency translation and post retirement liability adjustments of $4.1 million and $(87.3) million, respectively. As of December 31, 2013, represents cumulative foreign currency translation and post retirement liability adjustments of $5.1 million and $(70.9) million, respectively. As of December 31, 2012, represents cumulative foreign currency translation and post retirement liability adjustments of $5.7 million and $(86.7) million, respectively.

[2] Includes the tax benefit associated with share-based compensation of $8.6 million in 2014, $5.2 million in 2013 and $8.7 million in 2012.