CONSOLIDATED CONDENSED STATEMENT OF CHANGES IN STOCKHOLDERS' EQUITY (USD $) In Thousands, except Share data	Total	Common Stock	Additional Paid-in Capital	Retained Earnings	Accumulated Other Comprehensive Income	Treasury Stock
Beginning Balance at Dec. 31, 2013	$ 2,755,997	$ 1,865	$ 913,505	$ 2,707,439	$ 14,076	$ (880,888)
Beginning Balance (in shares) at Dec. 31, 2013	186,487,246	186,487,000
Net income	105,081			105,081
Foreign currency translation adjustment	(3,766)				(3,766)
Issuance of restricted stock (in shares)		1,067,000
Issuance of restricted stock		11	(11)
Vesting of stock unit awards		10,000
Forfeitures of restricted stock (in shares)		(46,000)
Forfeitures of restricted stock		(1)	1
Exercise of stock options (in shares)	1,715,195	1,715,000
Exercise of stock options	35,320	17	35,303
Stock-based compensation	19,945		19,945
Tax benefit related to stock-based compensation	8,682		8,682
Payment of cash dividends	(43,652)			(43,652)
Purchase of treasury stock	(18,147)					(18,147)
Ending Balance at Sep. 30, 2014	$ 2,859,460	$ 1,892	$ 977,425	$ 2,768,868	$ 10,310	$ (899,035)
Ending Balance (in shares) at Sep. 30, 2014	189,233,429	189,223,000