CONSOLIDATED STATEMENTS OF CHANGES IN EQUITY (USD $) In Thousands	Total	Common Shares Issued At Par Value [Member]	Capital Surplus [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Income (Loss) [Member]	Treasury Stock [Member]	Total Shareholders' Equity [Member]	Noncontrolling Interest [Member]
Balance, beginning of period at Dec. 31, 2011	$ 822,056	$ 72,426	$ 189,294	$ 1,095,953	$ (93,512)	$ (450,608)	$ 813,553	$ 8,503
Net income	217,821			216,993			216,993	828
Cash dividends ($1.08 per share)	(61,974)			(61,974)			(61,974)
Reacquisition on open market	(49,991)					(49,991)	(49,991)
Exercise of stock options, net of shares reacquired	16,566					16,566	16,566
Stock option amortization	8,571		8,571				8,571
Tax benefit — stock options and restricted stock	3,603		3,603				3,603
Restricted stock, net	5,627		3,004			2,623	5,627
Changes in pension and postretirement plan assets and benefit obligation, net of tax	(39,384)				(39,384)		(39,384)
Currency translation adjustment	4,481				4,819		4,819	(338)
Balance, end of period at Dec. 31, 2012	927,376	72,426	204,472	1,250,972	(128,077)	(481,410)	918,383	8,993
Net income	220,951			219,502			219,502	1,449
Cash dividends ($1.08 per share)	(67,272)			(67,272)			(67,272)
Exercise of stock options, net of shares reacquired	27,801					27,801	27,801
Stock option amortization	10,074		10,074				10,074
Tax benefit — stock options and restricted stock	6,353		6,353				6,353
Restricted stock, net	10,052		7,638			2,414	10,052
Changes in pension and postretirement plan assets and benefit obligation, net of tax	76,488				76,488		76,488
Currency translation adjustment	2,850				2,938		2,938	(88)
Balance, end of period at Dec. 31, 2013	1,214,673	72,426	228,537	1,403,202	(48,651)	(451,195)	1,204,319	10,354
Net income	193,569			192,672			192,672
Cash dividends ($1.08 per share)	(73,884)			(73,884)			(73,884)
Reacquisition on open market	(50,000)					(50,000)	(50,000)
Exercise of stock options, net of shares reacquired	16,038					16,038	16,038
Stock option amortization	8,944		8,944				8,944
Tax benefit — stock options and restricted stock	7,701		7,701				7,701
Restricted stock, net	4,062		4,008			54	4,062
Changes in pension and postretirement plan assets and benefit obligation, net of tax	(136,496)				(136,496)		(136,496)	402
Currency translation adjustment	(114,006)				(113,604)		(113,604)
Balance, end of period at Dec. 31, 2014	$ 1,070,601	$ 72,426		$ 1,521,990	$ (298,751)	$ (485,103)	$ 1,059,752	$ 10,849