Debt (Convertible and Exchangeable) (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended	9 Months Ended
Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2011	Sep. 30, 2010	Dec. 31, 2010
Convertible Senior Debentures [Member] \| Convertible Senior Debenture 3.63% Due 2026 [Member]
Principal Amount of Debt Component	$ 179,052		$ 179,052		$ 179,052
Unamortized discount	(356)		(356)		(2,553)
Carrying amount of debt component	178,696		178,696		176,499
Debt Instrument, Convertible, Carrying Amount of Equity Component	9,604		9,604		9,604
Debt Instrument, Interest Rate, Effective Percentage	5.32%		5.32%		5.32%
Debt Instrument Maturity	11/11		11/11
Debt Instrument Convertible Conversion Price Per Share	$ 148.46		$ 148.46
Number Of Shares On Which Aggregate Consideration To Be Delivered Upon Conversion Is Determined	1,206		1,206
Coupon Interest Of Debt (Discount) Premium	1,623	3,523	4,868	11,328
Discount Amortization Original Of Debt (Discount) Premium	202	417	598	1,320
Discount Amortization ASC470-20 Of Debt (Discount) Premium	540	1,117	1,599	3,533
Amortization of Debt Discount (Premium)	2,365	5,057	7,065	16,181
Convertible Senior Debentures [Member] \| Convertible Senior Debenture 2.85% Due 2027 [Member]
Principal Amount of Debt Component	10,233		10,233		10,233
Unamortized discount	(130)		(130)		(319)
Carrying amount of debt component	10,103		10,103		9,914
Debt Instrument, Convertible, Carrying Amount of Equity Component	956		956		956
Debt Instrument, Interest Rate, Effective Percentage	5.45%		5.45%		5.45%
Debt Instrument Maturity	04/12		04/12
Debt Instrument Convertible Conversion Price Per Share	$ 157.18		$ 157.18
Number Of Shares On Which Aggregate Consideration To Be Delivered Upon Conversion Is Determined	65		65
Coupon Interest Of Debt (Discount) Premium	74	160	219	480
Discount Amortization Original Of Debt (Discount) Premium	11	23	33	69
Discount Amortization ASC470-20 Of Debt (Discount) Premium	52	110	156	325
Amortization of Debt Discount (Premium)	137	293	408	874
Exchangeable Senior Debentures [Member] \| Exchangeable Senior Debenture 3.88% Due 2025 [Member]
Principal Amount of Debt Component	499,982		499,982		499,982
Unamortized discount	(3,843)		(3,843)		(8,982)
Carrying amount of debt component	496,139		496,139		491,000
Debt Instrument, Convertible, Carrying Amount of Equity Component	32,301		32,301		32,301
Debt Instrument, Interest Rate, Effective Percentage	5.32%		5.32%		5.32%
Debt Instrument Maturity	04/12		04/12
Debt Instrument Convertible Conversion Price Per Share	$ 87.17		$ 87.17
Number Of Shares On Which Aggregate Consideration To Be Delivered Upon Conversion Is Determined	5,736		5,736
Coupon Interest Of Debt (Discount) Premium	4,843	4,844	14,531	14,532
Discount Amortization Original Of Debt (Discount) Premium	410	389	1,213	1,151
Discount Amortization ASC470-20 Of Debt (Discount) Premium	1,326	1,258	3,926	3,724
Amortization of Debt Discount (Premium)	$ 6,579	$ 6,491	$ 19,670	$ 19,407

The component of interest expense representing the noncash expenses charged against earnings in the period to amortize debt discount and premium associated with the related debt instruments. Excludes amortization of financing costs. Alternate caption: Noncash Interest Expense.

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Including current and noncurrent portions, aggregate carrying amount of long-term borrowings as of the balance sheet date before deducting unamortized discount or premiums (if any). May include notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt, which had initial maturities beyond one year or beyond the normal operating cycle, if longer.

+ References

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The carrying amount of the equity component of convertible debt which may be settled in cash upon conversion.

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- Definition

Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium.

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-Publisher SEC

-Name Regulation S-X (SX)

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- Definition

The amount of debt discount that was originally recognized at the issuance of the instrument that has yet to be amortized.

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- Definition

This element represents the Principal amount of the debt component of the convertible and exchangeable senior debentures

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Coupon Interest Of Debt Discount Premium

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- Definition

The number of equity instruments that the holder of the debt instrument would receive if the debt was converted to equity.

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- Definition

Debt Instrument Maturity Date (String)

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Discount Amortization ASC470-20 Of Debt (Discount) Premium

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- Definition

Discount Amortization Original Of Debt (Discount) Premium

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Balance Type:	debit
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- Definition

Number of shares on which the aggregate consideration to be delivered upon conversion is determined

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