v2.4.0.6

Basis of Presentation (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2011	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2011	Dec. 31, 2010	Sep. 30, 2010	Jun. 30, 2010	Mar. 31, 2010	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009	Dec. 31, 2008
Consolidated Balance Sheet
Paid-in-capital in excess of par value	$ 291,950				$ 248,693				$ 291,950	$ 248,693
Retained earnings	305,931				265,686				305,931	265,686
Consolidated Statements of Income
Income Taxes									147,201	80,880	87,582
Net Income	105,400	108,000	111,200	88,000	86,300	78,900	82,200	51,800	412,578	299,215	203,346
Basic earnings per share	$ 0.91	$ 0.92	$ 0.93	$ 0.74	$ 0.73	$ 0.67	$ 0.69	$ 0.43	$ 3.51	$ 2.51	$ 1.66
Diluted earnings per share	$ 0.86	$ 0.87	$ 0.88	$ 0.70	$ 0.69	$ 0.63	$ 0.65	$ 0.41	$ 3.30	$ 2.37	$ 1.61
Common Share Amounts Used to Compute Basic and Diluted Earnings Per Share
Weighted average shares used in basic computations									117,540	119,004	122,442
Dilutive effect of exercise of equity grants outstanding									7,046	7,059	3,468
Dilutive effect of warrants									260	432	284
Weighted average shares used in diluted computations									124,846	126,495	126,194
Changes in Shareholders' Equity and Comprehensive Income
Excess tax benefit from exercise of stock options, SARs and restricted stock grants									27,450	8,045	3,587
Balance at December 31, 2010	560,188				487,212				560,188	487,212	359,311	241,731
Net Income	105,400	108,000	111,200	88,000	86,300	78,900	82,200	51,800	412,578	299,215	203,346
Consolidated Statement of Cash Flows
Net Income	105,400	108,000	111,200	88,000	86,300	78,900	82,200	51,800	412,578	299,215	203,346
Excess tax benefits from share-based payment arrangements									(27,450)	(7,728)	(3,266)
Net cash provided by operating activities									509,331	389,084	285,056
Excess tax benefits from share-based payment arrangements									27,450	7,728	3,266
Net cash used in financing activities									(337,799)	(263,162)	(213,327)
Retained Earnings [Member]
Consolidated Statements of Income
Net Income									412,578	299,215	203,346
Changes in Shareholders' Equity and Comprehensive Income
Balance at December 31, 2010	305,931				265,686				305,931	265,686	159,705	72,507
Net Income									412,578	299,215	203,346
Consolidated Statement of Cash Flows
Net Income									412,578	299,215	203,346
Comprehensive Income [Member]
Consolidated Statements of Income
Net Income									412,578	299,215	203,346
Changes in Shareholders' Equity and Comprehensive Income
Net Income									412,578	299,215	203,346
Total comprehensive income									402,054	295,326	208,564
Consolidated Statement of Cash Flows
Net Income									412,578	299,215	203,346
As Reported [Member]
Consolidated Balance Sheet
Paid-in-capital in excess of par value					257,375					257,375
Retained earnings					257,004					257,004
Consolidated Statements of Income
Income Taxes										89,562
Net Income				87,600	81,000					290,533
Basic earnings per share				$ 0.74	$ 0.69					$ 2.44
Diluted earnings per share				$ 0.71	$ 0.65					$ 2.33
Common Share Amounts Used to Compute Basic and Diluted Earnings Per Share
Weighted average shares used in basic computations										119,004
Dilutive effect of exercise of equity grants outstanding										5,076
Dilutive effect of warrants										432
Weighted average shares used in diluted computations										124,512
Changes in Shareholders' Equity and Comprehensive Income
Excess tax benefit from exercise of stock options, SARs and restricted stock grants										16,727
Balance at December 31, 2010					257,375					257,375
Net Income				87,600	81,000					290,533
Consolidated Statement of Cash Flows
Net Income				87,600	81,000					290,533
Excess tax benefits from share-based payment arrangements										(16,410)
Deferred Income Taxes										(24,631)
Net cash provided by operating activities										380,402
Excess tax benefits from share-based payment arrangements										16,410
Net cash used in financing activities										(254,480)
As Reported [Member] | Retained Earnings [Member]
Consolidated Statements of Income
Net Income										290,533
Changes in Shareholders' Equity and Comprehensive Income
Balance at December 31, 2010					257,004					257,004
Net Income										290,533
Consolidated Statement of Cash Flows
Net Income										290,533
As Reported [Member] | Comprehensive Income [Member]
Consolidated Statements of Income
Net Income										290,533
Changes in Shareholders' Equity and Comprehensive Income
Net Income										290,533
Total comprehensive income										286,644
Consolidated Statement of Cash Flows
Net Income										290,533
As Adjusted [Member]
Consolidated Balance Sheet
Paid-in-capital in excess of par value					248,693					248,693
Retained earnings					265,686					265,686
Consolidated Statements of Income
Income Taxes										80,880
Net Income										299,215
Basic earnings per share										$ 2.51
Diluted earnings per share										$ 2.37
Common Share Amounts Used to Compute Basic and Diluted Earnings Per Share
Weighted average shares used in basic computations										119,004
Dilutive effect of exercise of equity grants outstanding										7,059
Dilutive effect of warrants										432
Weighted average shares used in diluted computations										126,495
Changes in Shareholders' Equity and Comprehensive Income
Excess tax benefit from exercise of stock options, SARs and restricted stock grants										8,045
Balance at December 31, 2010					248,693					248,693
Net Income										299,215
Consolidated Statement of Cash Flows
Net Income										299,215
Excess tax benefits from share-based payment arrangements										(7,728)
Deferred Income Taxes										(33,313)
Net cash provided by operating activities										389,084
Excess tax benefits from share-based payment arrangements										7,728
Net cash used in financing activities										(263,162)
As Adjusted [Member] | Retained Earnings [Member]
Consolidated Statements of Income
Net Income										299,215
Changes in Shareholders' Equity and Comprehensive Income
Balance at December 31, 2010					265,686					265,686
Net Income										299,215
Consolidated Statement of Cash Flows
Net Income										299,215
As Adjusted [Member] | Comprehensive Income [Member]
Consolidated Statements of Income
Net Income										299,215
Changes in Shareholders' Equity and Comprehensive Income
Net Income										299,215
Total comprehensive income										295,326
Consolidated Statement of Cash Flows
Net Income										299,215
As Computed Under Prior Method [Member]
Consolidated Statements of Income
Income Taxes									159,083
Net Income									400,696
Basic earnings per share									$ 3.41
Diluted earnings per share									$ 3.25
Changes in Shareholders' Equity and Comprehensive Income
Net Income									400,696
Consolidated Statement of Cash Flows
Net Income									$ 400,696

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