Debt instrument impact of convertible debt accretion.

No definition available.

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- Definition

Discount rate of Senior notes.

+ References

No definition available.

+ Details

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- Definition

Notes issued to be redeemed at maturity not subject to sinking fund.

+ References

No definition available.

+ Details

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- Definition

Notes issued to be redeemed based on yield maintenance calculation.

+ References

No definition available.

+ Details

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- Definition

Notes redeemable prior to maturity based on par value plus a make-whole premium.

+ References

No definition available.

+ Details

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- Definition

Purchase of options.

+ References

No definition available.

+ Details

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- Definition

Redemption Period.

+ References

No definition available.

+ Details

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- Details

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- Definition

Remaining amortization period for any discount on the liability component of convertible debt which may be settled in cash upon conversion.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 470

-SubTopic 20

-Section 50

-Paragraph 5

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=6928298&loc=SL6031898-161870

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name FASB Staff Position (FSP)

-Number APB14-1

-Paragraph 32

-Subparagraph a

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

+ Details

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- Definition

States whether the entity was in compliance with the debt covenants throughout the reporting period, and describes facts and circumstances of any compliance failure.

+ References

+ Details

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- Definition

The stated principal amount of the debt instrument at time of issuance, which may vary from the carrying amount because of unamortized premium or discount.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher AICPA

-Name Accounting Principles Board Opinion (APB)

-Number 21

-Paragraph 16, 20

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 835

-SubTopic 30

-Section 45

-Paragraph 2

-URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28551-108399

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 835

-SubTopic 30

-Section 55

-Paragraph 8

-URI http://asc.fasb.org/extlink&oid=6584090&loc=d3e28878-108400

+ Details

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- Definition

Interest rate stated in the contractual debt agreement.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 22

-Article 5

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.22(a)(1))

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

+ Details

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- Definition

Date when the debt instrument is scheduled to be fully repaid, which may be presented in a variety of ways (year, month and year, day, month and year, quarter, etc.).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 129

-Paragraph 2, 4

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 22

-Article 5

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.22(a)(2))

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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- Definition

Description of the payment terms of the debt instrument (for example, whether periodic payments include principal and frequency of payments) and discussion about any contingencies associated with the payment.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.22(a)(3))

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 129

-Paragraph 2, 4

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 22

-Article 5

Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 942

-SubTopic 470

-Section 50

-Paragraph 3

-Subparagraph (c)

-URI http://asc.fasb.org/extlink&oid=6479336&loc=d3e64711-112823

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- Definition

Gross amount of debt extinguished.

+ References

No definition available.

+ Details

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Period Type:	duration

- Definition

Amount represents the difference between the fair value of the payments made and the carrying amount of the debt at the time of its extinguishment.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 470

-SubTopic 50

-Section 40

-Paragraph 4

-URI http://asc.fasb.org/extlink&oid=6850294&loc=d3e12355-112629

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-Publisher AICPA

-Name Accounting Principles Board Opinion (APB)

-Number 26

-Paragraph 20, 21

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 28

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3602-108585

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-Name Accounting Standards Codification

-Topic 470

-SubTopic 50

-Section 40

-Paragraph 2

-URI http://asc.fasb.org/extlink&oid=6850294&loc=d3e12317-112629

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- Definition

The interest rate applicable to the portion of the carrying amount of long-term borrowings outstanding as of the balance sheet date, including current maturities, which accrues interest at a set, unchanging rate.

+ References

+ Details

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Senior Notes (Details Textual) (USD $)	3 Months Ended	12 Months Ended
Senior Notes (Details Textual) (USD $)	Mar. 31, 2011	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Debt Instrument, Unamortized Discount (Premium), Net
Gain or Loss on Senior Convertible Notes		$ (89,000)	$ 485,000	$ 145,050,000
Senior note principal amount	300,000,000
Senior Notes, Covenant Compliance		The Company was in compliance with these covenants at December 31, 2011.
Senior Notes (Textual) [Abstract]
Senior note interest rate	4.75%
Senior Notes maturity date	Apr. 01, 2018
Discount rate of Senior notes	99.315%
Redemption of notes		100% of the principal amount plus accrued and unpaid interest
Debt instrument - impact of convertible debt accretion		100,000	4,900,000	20,900,000
Interest coupon rates		5.90%	5.90%
Notes Issued to be redeemed at maturity		82,200,000
Redeemable prior to maturity		223,500,000
Notes issued subsequent period		2,000,000,000
Redemption Period		within90 days of the maturity date
Senior Convertible Notes 2010 [Member]
Debt Instrument, Unamortized Discount (Premium), Net
Purchase of options		0
Senior Convertible Notes Due 2012 [Member]
Debt Instrument, Unamortized Discount (Premium), Net
Remaining amortization periods for debt discount		3
Senior Notes (Textual) [Abstract]
Senior Notes maturity date		Mar. 01, 2012
Interest coupon rates		3.00%
Senior Convertible Notes Due 2040 [Member]
Debt Instrument, Unamortized Discount (Premium), Net
Remaining amortization periods for debt discount		46
Senior Notes (Textual) [Abstract]
Senior Notes maturity date		Nov. 01, 2040
Interest coupon rates		1.75%
Unsecured Debt [Member]
Debt Instrument, Unamortized Discount (Premium), Net
Aggregate Extinguishment of Debt, Amount		36,100,000	259,100,000	816,200,000
Gain or Loss on Senior Convertible Notes		100,000	100,000	145,100,000
Senior Notes, Covenant Compliance		The Company was in compliance with all of the financial and other covenants at December 31, 2011
Senior Convertible Notes [Member]
Debt Instrument, Unamortized Discount (Premium), Net
Aggregate Extinguishment of Debt, Amount		19,400,000	140,600,000	404,800,000
Senior note principal amount		$ 529,509,000	$ 637,626,000