CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY - USD ($) $ in Thousands	Cumulative Preferred Stock [Member]	Common Stock [Member]	Capital In Excess Of Par Value [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Loss [Member]	Treasury Stock [Member]	Total
Balance at beginning of year at Dec. 31, 2013		$ 194,920	$ 902,633	$ 8,058,792	$ 172,119	$ (732,734)
Exercise of stock options, including income tax benefits		120	(11,422)
Foreign currency translation gains (losses), net of income taxes					(271,491)		$ (271,491)
Purchase of treasury shares						(375,000)
Net income (loss) for the year				905,611			905,611
Restricted stock transactions and other			(27,920)
Cash dividends - $1.20 per share in 2016, $1.40 per share in 2015 and $1.325 per share in 2014				(236,371)
Retirement and postretirement benefit plans, net of income taxes					(72,796)		(72,796)
Sale of stock under employee stock purchase plans						420
Stock-based compensation			43,490
Other			(40)
Deferred loss on interest rate hedges, reclassified to interest expense, net of income taxes					1,913		1,913
Awarded restricted stock						21,190
Balance at end of year at Dec. 31, 2014		195,040	906,741	8,728,032	(170,255)	(1,086,124)	8,573,434
Exercise of stock options, including income tax benefits		16	(376)
Foreign currency translation gains (losses), net of income taxes					(546,705)		(546,705)
Purchase of treasury shares						(250,000)
Net income (loss) for the year				(2,270,833)			(2,270,833)
Restricted stock transactions and other			(38,415)
Cash dividends - $1.20 per share in 2016, $1.40 per share in 2015 and $1.325 per share in 2014				(244,998)
Retirement and postretirement benefit plans, net of income taxes					10,492		10,492
Sale of stock under employee stock purchase plans						491
Stock-based compensation			42,322
Other			(198)
Deferred loss on interest rate hedges, reclassified to interest expense, net of income taxes					1,926		1,926
Awarded restricted stock						29,572
Balance at end of year at Dec. 31, 2015		195,056	910,074	6,212,201	(704,542)	(1,306,061)	5,306,728	[1]
Exercise of stock options, including income tax benefits			(12,017)
Foreign currency translation gains (losses), net of income taxes					66,449		66,449
Net income (loss) for the year				(275,970)			(275,970)
Restricted stock transactions and other			(10,078)
Cash dividends - $1.20 per share in 2016, $1.40 per share in 2015 and $1.325 per share in 2014				(206,635)
Retirement and postretirement benefit plans, net of income taxes					7,955		7,955
Sale of stock under employee stock purchase plans						509
Stock-based compensation			29,119
Other			(299)
Deferred loss on interest rate hedges, reclassified to interest expense, net of income taxes					1,926		1,926
Awarded restricted stock						8,992
Balance at end of year at Dec. 31, 2016		$ 195,056	$ 916,799	$ 5,729,596	$ (628,212)	$ (1,296,560)	$ 4,916,679

[1] Reclassified to conform to current presentation. See Note B for additional information.