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 Income (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		97	(11,232)
Foreign currency translation losses, net of income taxes					(3,045)		$ (3,045)
Purchase of treasury shares						(375,000)
Net income (loss) for the period				284,665			284,665
Other			(23)
Restricted stock transactions and other			(27,970)
Cash dividends				(112,126)
Retirement and postretirement benefit plans, net of income taxes					2,491		(2,491)
Sale of stock under employee stock purchase plans						275
Stock-based compensation			22,884
Deferred loss on interest rate hedges reclassified to interest expense, net of income taxes					966		966
Awarded restricted stock, net of forfeitures						21,185
Balance at end of year at Jun. 30, 2014		195,017	886,292	8,231,331	172,531	(1,086,274)	8,398,897
Balance at beginning of year at Dec. 31, 2014		195,040	906,741	8,728,032	(170,255)	(1,086,124)	8,573,434	[1]
Exercise of stock options, including income tax benefits		16	(376)
Foreign currency translation losses, net of income taxes					(266,614)		(266,614)
Purchase of treasury shares						(250,000)
Net income (loss) for the period				(88,275)			(88,275)
Other			(65)
Restricted stock transactions and other			(38,032)
Cash dividends				(124,581)
Retirement and postretirement benefit plans, net of income taxes					5,989		(5,989)
Sale of stock under employee stock purchase plans						246
Stock-based compensation			24,285
Deferred loss on interest rate hedges reclassified to interest expense, net of income taxes					963		963
Awarded restricted stock, net of forfeitures						29,056
Balance at end of year at Jun. 30, 2015		$ 195,056	$ 892,553	$ 8,515,176	$ (429,917)	$ (1,306,822)	$ 7,866,046

[1] Reclassified to conform to current presentation.