Fair Value Measurements (Details 2) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2014	Dec. 31, 2013
Fair Value of Financial Instruments
Carrying Value	$ 3,956,497	$ 3,983,490
Fair Value	4,385,345	4,251,473
Subsidiary preferred stock, carrying value		69,188
Subsidiary preferred stock, fair value		69,000
2.35% senior notes due September 2016
Fair Value of Financial Instruments
Carrying Value	349,853	349,820
Fair Value	358,596	354,694
Interest rate on senior notes due (as a percent)	2.35%
6.15% senior notes due February 2018
Fair Value of Financial Instruments
Carrying Value	970,541	969,928
Fair Value	1,113,255	1,097,480
Interest rate on senior notes due (as a percent)	6.15%
9.25% senior notes due January 2019
Fair Value of Financial Instruments
Carrying Value	339,607	339,607
Fair Value	434,405	428,733
Interest rate on senior notes due (as a percent)	9.25%
5.00% senior notes due September 2020
Fair Value of Financial Instruments
Carrying Value	698,100	697,947
Fair Value	785,883	731,955
Interest rate on senior notes due (as a percent)	5.00%
4.625% senior notes due September 2021
Fair Value of Financial Instruments
Carrying Value	698,268	698,148
Fair Value	756,623	709,793
Interest rate on senior notes due (as a percent)	4.625%
5.10% senior notes due September 2023
Fair Value of Financial Instruments
Carrying Value	348,829	348,765
Fair Value	385,284	349,731
Interest rate on senior notes due (as a percent)	5.10%
Revolving Credit Facility
Fair Value of Financial Instruments
Carrying Value	110,000	170,000
Fair Value	110,000	170,000
Commercial paper
Fair Value of Financial Instruments
Carrying Value	441,072	329,844
Fair Value	441,072	329,844
Other
Fair Value of Financial Instruments
Carrying Value	227	10,243
Fair Value	$ 227	$ 10,243

Represents the information pertaining to fair value of the temporary equity.

No definition available.

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- Definition

Amount of long-term debt before deduction of unamortized discount or premium. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt, with initial maturities beyond one year or the normal operating cycle, if longer.

+ References

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 20

-Article 5

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)

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

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 16

-Article 9

+ Details

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- Definition

Fair value portion of debt instrument payable, including, but not limited to, notes payable and loans payable.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 825

-SubTopic 10

-Section 50

-Paragraph 10

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=28364263&loc=d3e13433-108611

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 825

-SubTopic 10

-Section 50

-Paragraph 12

-URI http://asc.fasb.org/extlink&oid=28364263&loc=d3e13476-108611

+ Details

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- Definition

Contractual interest rate for funds borrowed, under the 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

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- Details

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- Definition

Carrying amount, attributable to noncontrolling interests, of an entity's issued and outstanding stock which is not included within permanent equity. Temporary equity is a security with redemption features that are outside the control of the issuer, is not classified as an asset or liability in conformity with GAAP, and is not mandatorily redeemable. Includes any type of security that is redeemable at a fixed or determinable price or on a fixed or determinable date or dates, is redeemable at the option of the holder, or has conditions for redemption which are not solely within the control of the issuer. Includes stock with a put option held by an ESOP and stock redeemable by a holder only in the event of a change in control of the issuer.

+ References

No definition available.

+ Details

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