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, 2014		$ 195,040	$ 906,741	$ 8,728,032	$ (170,255)	$ (1,086,124)
Exercise of stock options		16	(376)
Foreign currency translation gain (losses), net of income taxes					(546,705)		$ (546,705)
Purchase of treasury shares						(250,000)
Net loss for the year				(2,270,833)			(2,270,833)	[1]
Restricted stock transactions and other			(38,415)
Cash dividends - $1.00 per share in 2017, $1.20 per share in 2016 and $1.40 per share in 2015				(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
Exercise of stock options			(12,017)
Foreign currency translation gain (losses), net of income taxes					66,449		66,449
Net loss for the year				(275,970)			(275,970)	[1]
Restricted stock transactions and other			(10,078)
Cash dividends - $1.00 per share in 2017, $1.20 per share in 2016 and $1.40 per share in 2015				(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
Foreign currency translation gain (losses), net of income taxes					171,725		171,725
Net loss for the year				(311,789)			(311,789)
Restricted stock transactions and other			(26,553)
Cash dividends - $1.00 per share in 2017, $1.20 per share in 2016 and $1.40 per share in 2015				(172,565)
Retirement and postretirement benefit plans, net of income taxes					(7,682)		(7,682)
Sale of stock under employee stock purchase plans						146
Stock-based compensation			27,496
Other			(77)
Deferred loss on interest rate hedges reclassified to interest expense, net of income taxes					1,926		1,926
Awarded restricted stock						20,885
Balance at end of year at Dec. 31, 2017		$ 195,056	$ 917,665	$ 5,245,242	$ (462,243)	$ (1,275,529)	$ 4,620,191

[1] Reclassified to conform to current presentation (see Note A).