Consolidated Statements of Stockholders' Equity (USD $) In Thousands, unless otherwise specified	Total	Common Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	Treasury Stock [Member]	Accumulated Other Comprehensive Income (Loss) [Member]
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest at Dec. 31, 2008 (Scenario, Previously Reported [Member])	$ 3,654,869	$ 125,583	$ 2,224,129	$ 1,498,171	$ (193,178)	$ 164
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest (Restatement Adjustment [Member])	2,817	0	0	2,817	0	0
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest at Dec. 31, 2008	3,657,686	125,583	2,224,129	1,500,988	(193,178)	164
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Dividends, Common Stock, Cash	(10,733)	0	0	(10,733)	0	0
Stocks Acquired Issued For Benefit Plans	592	0	23	0	569	0
Stock Issued During Period Value Stock Options Exercised Net Of Amortization Forfeitures	25,698	1,079	24,619	0	0	0
Stock Issued During Period, Value, Restricted Stock Award, Net of Forfeitures	10,638	1,163	21,883	0	(12,408)	0
Adjustments to Additional Paid in Capital, Equity Component of Convertible Debt	(1,490)	0	(749)	(741)	0	0
Subtotal of Stockholders Equity including portion attributable to non-controlling interest prior to Comprehensive Income	3,682,391	127,825	2,269,905	1,489,514	(205,017)	164
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest	211,923	0	0	211,923	0	0
Other Comprehensive Income (Loss), Net of Tax [Abstract]
Other Comprehensive Income (Loss), Unrealized Holding Gain (Loss) on Securities Arising During Period, Net of Tax	(7,267)	0	0	0	0	(7,267)
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax	14,934	0	0	0	0	14,934
Other Comprehensive Income (Loss), Amortization, Pension and Other Postretirement Benefit Plans, Net Prior Service Cost (Credit) Recognized in Net Periodic Benefit Cost, before Tax	2,045	0	0	0	0	2,045
Other Comprehensive Income (Loss), Finalization of Pension and Non-Pension Postretirement Plan Valuation, Net of Tax	(25,216)	0	0	0	0	(25,216)
Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest	196,419	0	0	211,923	0	(15,504)
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest CLONE at Dec. 31, 2009	3,878,810	127,825	2,269,905	1,701,437	(205,017)	(15,340)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Dividends, Common Stock, Cash	(12,839)	0	0	(12,839)	0	0
Stocks Acquired Issued For Benefit Plans	68	0	0	0	68	0
Stock Issued During Period Value Stock Options Exercised Net Of Amortization Forfeitures	12,539	386	12,153	0	0	0
Treasury Stock, Value, Acquired, Cost Method	(100,942)	0	0	0	(100,942)	0
Stock Issued During Period, Value, Restricted Stock Award, Net of Forfeitures	10,597	1,423	36,837	0	(27,663)	0
Adjustments to Additional Paid in Capital, Equity Component of Convertible Debt	106,083	0	106,083	0	0	0
Subtotal of Stockholders Equity including portion attributable to non-controlling interest prior to Comprehensive Income	3,894,316	129,634	2,424,978	1,688,598	(333,554)	(15,340)
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest	(106,109)	0	0	(106,109)	0	0
Other Comprehensive Income (Loss), Net of Tax [Abstract]
Other Comprehensive Income (Loss), Unrealized Holding Gain (Loss) on Securities Arising During Period, Net of Tax	924	0	0	0	0	924
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax	(3,807)	0	0	0	0	(3,807)
Other Comprehensive Income (Loss), Amortization, Pension and Other Postretirement Benefit Plans, Net Prior Service Cost (Credit) Recognized in Net Periodic Benefit Cost, before Tax	3,458	0	0	0	0	3,458
Other Comprehensive Income (Loss), Finalization of Pension and Non-Pension Postretirement Plan Valuation, Net of Tax	29,979	0	0	0	0	29,979
Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest	(75,555)	0	0	(106,109)	0	30,554
Stockholders' Equity Attributable to Parent	3,818,761	129,634	2,424,978	1,582,489	(333,554)	15,214
Accumulated Other Comprehensive Income (Loss), Net of Tax	15,214
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest CLONE at Dec. 31, 2010 (Scenario, Previously Reported [Member])	3,815,944
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest CLONE (Restatement Adjustment [Member])	2,817
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest CLONE at Dec. 31, 2010	3,818,761	129,634	2,424,978	1,582,489	(333,554)	15,214
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Dividends, Common Stock, Cash	(17,217)	0	0	(17,217)	0	0
Stock Issued During Period Value Stock Options Exercised Net Of Amortization Forfeitures	42,010	1,565	40,466	0	(21)	0
Treasury Stock, Value, Acquired, Cost Method	(140,127)	0	0	0	(140,127)	0
Translation adjustment recorde as loss on sales of CRO	(2,210)	0	0	0	0	(2,210)
Stock Issued During Period, Value, Restricted Stock Award, Net of Forfeitures	13,648	558	23,497	0	(10,407)	0
Stockholders' Equity, Other	(381)	0	0	(367)	(14)	0
Subtotal of Stockholders Equity including portion attributable to non-controlling interest prior to Comprehensive Income	3,714,484	131,757	2,488,941	1,564,905	(484,123)	13,004
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest	86,924	0	0	86,924	0	0
Other Comprehensive Income (Loss), Net of Tax [Abstract]
Other Comprehensive Income (Loss), Unrealized Holding Gain (Loss) on Securities Arising During Period, Net of Tax	(1,274)	0	0	0	0	(1,274)
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax	(4,691)	0	0	0	0	(4,691)
Other Comprehensive Income (Loss), Amortization, Pension and Other Postretirement Benefit Plans, Net Prior Service Cost (Credit) Recognized in Net Periodic Benefit Cost, before Tax	(7)	0	0	0	0	(7)
Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest	80,952	0	0	86,924	0	(5,972)
Accumulated Other Comprehensive Income (Loss), Net of Tax	7,032					7,032
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest CLONE at Dec. 31, 2011	$ 3,795,436	$ 131,757	$ 2,488,941	$ 1,651,829	$ (484,123)