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, 2015		$ 195,056	$ 910,074	$ 6,212,201	$ (704,542)	$ (1,306,061)
Foreign currency translation gain, net of income taxes					124,522		$ 124,522
Net loss for the period				(212,048)			(212,048)
Restricted stock transactions and other			(10,078)
Cash dividends				(163,586)
Retirement and postretirement benefit plans, net of income taxes					7,544		7,544
Sale of stock under employee stock purchase plan						389
Stock-based compensation			21,918
Other			(239)
Deferred loss on interest rate hedges reclassified to interest expense, net of income taxes					1,445		1,445
Awarded restricted stock, net of forfeitures						8,993
Balance at end of year at Sep. 30, 2016		195,056	921,675	5,836,567	(571,031)	(1,296,679)	5,085,588
Balance at beginning 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, net of income taxes					194,094		194,094
Net loss for the period				(25,000)			(25,000)
Restricted stock transactions and other			(26,553)
Cash dividends				(129,421)
Retirement and postretirement benefit plans, net of income taxes					7,169		7,169
Sale of stock under employee stock purchase plan						145
Stock-based compensation			20,767
Other			(77)
Deferred loss on interest rate hedges reclassified to interest expense, net of income taxes					1,445		1,445
Awarded restricted stock, net of forfeitures						20,886
Balance at end of year at Sep. 30, 2017		$ 195,056	$ 910,936	$ 5,575,175	$ (425,504)	$ (1,275,529)	$ 4,980,134