Debt instrument term.

No definition available.

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- Definition

Debt repurchase price percentage in the event of change of control.

+ References

No definition available.

+ Details

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- Definition

Long-term debt issue price as a percentage of principal amount.

+ References

No definition available.

+ Details

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- Definition

Long-term debt redemption price as a percentage of principal amount.

+ References

No definition available.

+ Details

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- Definition

Long-term debt redemption with net proceeds from equity offerings as a percentage of principal amount.

+ References

No definition available.

+ 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 FASB

-Name Accounting Standards Codification

-Topic 835

-SubTopic 30

-Section 45

-Paragraph 2

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

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

-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

Reference 3: 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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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.

+ Details

Name:	us-gaap_DebtInstrumentFaceAmount
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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Increase of additional borrowings on existing and new debt instruments.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 235

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.4-08.(f))

-URI http://asc.fasb.org/extlink&oid=6881521&loc=d3e23780-122690

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 08

-Paragraph f

-Article 4

+ Details

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Period Type:	duration

- 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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- Details

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- Definition

Amount of the required periodic payments applied to interest.

+ 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)

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

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 22

-Article 5

+ Details

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Balance Type:	debit
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Long-Term Debt (Details) (USD $)	12 Months Ended		12 Months Ended		12 Months Ended		12 Months Ended		0 Months Ended	12 Months Ended		12 Months Ended		0 Months Ended	12 Months Ended		0 Months Ended		12 Months Ended		12 Months Ended
Long-Term Debt (Details) (USD $)	Dec. 31, 2012 7 % Senior Notes due 2013	Mar. 31, 2013 7 % Senior Notes due 2013	Dec. 31, 2012 6 5/8% Senior Notes due 2014	Mar. 31, 2013 6 5/8% Senior Notes due 2014	Dec. 31, 2012 7 3/4% Senior Notes due 2015	Mar. 31, 2013 7 3/4% Senior Notes due 2015	Dec. 31, 2012 7 1/8% Senior Notes due 2016	Mar. 31, 2013 7 1/8% Senior Notes due 2016	May 16, 2012 4 5/8% Senior Notes due 2017	Dec. 31, 2012 4 5/8% Senior Notes due 2017	Mar. 31, 2013 4 5/8% Senior Notes due 2017	Dec. 31, 2012 7 7/8% Senior Notes due 2019	Mar. 31, 2013 7 7/8% Senior Notes due 2019	May 05, 2011 6 3/4% Senior Notes due 2021	Dec. 31, 2012 6 3/4% Senior Notes due 2021	Mar. 31, 2013 6 3/4% Senior Notes due 2021	Jul. 26, 2012 5 7/8% Senior Notes due 2022	May 16, 2012 5 7/8% Senior Notes due 2022	Dec. 31, 2012 5 7/8% Senior Notes due 2022	Mar. 31, 2013 5 7/8% Senior Notes due 2022	Dec. 31, 2012 5% Senior Notes due 2023	Mar. 31, 2013 5% Senior Notes due 2023	Dec. 27, 2012 5% Senior Notes due 2023
Long-term debt
Interest rate (as a percent)	7.00%	7.00%	6.625%	6.625%	7.75%	7.75%	7.125%	7.125%		4.625%	4.625%	7.875%	7.875%		6.75%	6.75%			5.875%	5.875%	5.00%	5.00%
Percentage of principal amount at which the entity may redeem some or all of the notes at any time	100.00%		100.00%		100.00%		100.00%			100.00%		100.00%			100.00%				100.00%		100.00%
Percentage of principal amount at which notes may be required to be repurchased in event of change of control	101.00%		101.00%		101.00%		101.00%			101.00%		101.00%			101.00%				101.00%		101.00%
Aggregate principal amount		$ 500,000,000							$ 900,000,000					$ 2,000,000,000				$ 1,000,000,000					$ 1,500,000,000
Term of debt instrument									5 years					10 years			10 years	10 years
Debt instrument issuance as a percentage of face amount									100.00%					99.093%			100.75%	100.00%					100.00%
Maximum percentage of the aggregate principal amount of notes with net proceeds of certain equity offerings or capital contributions										35.00%					35.00%				35.00%		35.00%
Additional borrowings																	100,000,000
Annual Debt Service Requirements	$ 35,000,000		$ 66,250,000		$ 58,125,000		$ 106,875,000			$ 41,625,000		$ 110,250,000			$ 135,000,000				$ 117,500,000		$ 75,000,000