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					161,891		$ 161,891
Net income (loss) for the period				(195,872)			(195,872)
Restricted stock transactions and other			(10,078)
Cash dividends				(120,535)
Retirement and postretirement benefit plans, net of income taxes					5,029		5,029
Sale of stock under employee stock purchase plans						334
Stock-based compensation			14,454
Other			(214)
Deferred loss on interest rate hedges reclassified to interest expense, net of income taxes					963		963
Awarded restricted stock, net of forfeitures						8,993
Balance at end of year at Jun. 30, 2016		195,056	914,236	5,895,794	(536,659)	(1,296,734)	5,171,693
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					92,884		92,884
Net income (loss) for the period				40,893			40,893
Restricted stock transactions and other			(26,483)
Cash dividends				(86,278)
Retirement and postretirement benefit plans, net of income taxes					4,773		4,773
Sale of stock under employee stock purchase plans						145
Stock-based compensation			13,302
Other			(76)
Deferred loss on interest rate hedges reclassified to interest expense, net of income taxes					963		963
Awarded restricted stock, net of forfeitures						20,886
Balance at end of year at Jun. 30, 2017		$ 195,056	$ 903,542	$ 5,684,211	$ (529,592)	$ (1,275,529)	$ 4,977,688