Face (par) amount of debt instrument at time of issuance.

Reference 1: 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=64930739&loc=d3e28878-108400

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=64930785&loc=d3e28551-108399

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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 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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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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- Definition

Face (par) amount of the original debt instrument that was repurchased.

+ References

No definition available.

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- Definition

Difference between the fair value of payments made and the carrying amount of debt which is extinguished prior to maturity.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 50
-Section 40
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=49170532&loc=d3e12317-112629

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3602-108585

Reference 3: 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=49170532&loc=d3e12355-112629

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Indebtedness (Activity) (Details) - USD ($)	1 Months Ended		12 Months Ended
Indebtedness (Activity) (Details) - USD ($)	Nov. 30, 2016	Sep. 30, 2016	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Aug. 31, 2015	Mar. 31, 2015
Debt Instrument [Line Items]
Debt instrument, face amount			$ 2,569,906,000
Loss on debt extinguishment			27,099,000	$ 0	$ 0
Senior Notes [Member] \| 5.125% Senior Notes [Member]
Debt Instrument [Line Items]
Stated interest rate							5.125%
Repurchased face amount of debt							$ 300,000,000
Senior Notes [Member] \| 3.75% Senior Notes [Member]
Debt Instrument [Line Items]
Stated interest rate							3.75%
Debt instrument, face amount							$ 400,000,000
Senior Notes [Member] \| 3.25% Senior Notes [Member]
Debt Instrument [Line Items]
Stated interest rate		3.25%
Debt instrument, face amount		$ 400,000,000
Senior Notes [Member] \| 5.5% Senior Note [Member]
Debt Instrument [Line Items]
Stated interest rate		5.50%
Repurchased face amount of debt		$ 300,000,000
Loss on debt extinguishment		$ 3,800,000
Senior Notes [Member] \| 6.625% Senior Note [Member]
Debt Instrument [Line Items]
Stated interest rate	6.625%
Repurchased face amount of debt	$ 296,500,000.0
Mortgages [Member] \| 7.0% Mortgage [Member]
Debt Instrument [Line Items]
Stated interest rate						7.00%
Repurchased face amount of debt						$ 105,800,000.0
Mortgages [Member] \| 7.5% Mortgage [Member]
Debt Instrument [Line Items]
Stated interest rate				7.50%
Repurchased face amount of debt				$ 59,700,000.0
Unsecured Debt [Member]
Debt Instrument [Line Items]
Debt instrument, face amount			$ 2,300,000,000
Unsecured Debt [Member] \| 3.435% unsecured notes [Member]
Debt Instrument [Line Items]
Stated interest rate				3.40%
Repurchased face amount of debt				$ 16,000,000.0
Medium-term Notes [Member] \| 7.5% Medium Term Note [Member]
Debt Instrument [Line Items]
Stated interest rate	7.50%
Repurchased face amount of debt	$ 100,000,000.0
Unsecured Debt [Member]
Debt Instrument [Line Items]
Loss on debt extinguishment	$ 23,600,000