Consolidated Statement of Stockholders' Equity (unaudited) - 9 months ended Sep. 30, 2015 - USD ($) $ in Thousands	Total	Common Stock	Additional Paid-in Capital	Retained Earnings	Accumulated Other Comprehensive Income	Treasury Stock
Balance at December 31, 2014 at Dec. 31, 2014	$ 5,181,307	$ 1,490	$ 3,131,274	$ 4,809,287	$ 555,767	$ (3,316,511)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock plan exercises	(15,827)	7	(15,834)
Stock plan compensation expense	24,162		24,162
Change in tax benefit from share-based payment arrangements	(801)		(801)
Dividends	(60,906)			(60,906)
Acquisition of common stock	(210,418)					(210,418)
Net (loss) income	75,811			75,811
Other comprehensive loss	(309,729)				(309,729)
Balance, September 30, 2015 at Sep. 30, 2015	$ 4,683,599	$ 1,497	$ 3,138,801	$ 4,824,192	$ 246,038	$ (3,526,929)