Fair Value of Instruments (Estimated Fair Value and Carrying Amounts) (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term Debt	$ 17,900	$ 15,600
3.400% Notes Due 2020
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Interest rate (as a percent)	3.40%
3.950% Notes Due 2022
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Interest rate (as a percent)	3.95%
3.625% notes due 2022
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Interest rate (as a percent)	3.625%
4.750% Notes Due 2025
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Interest rate (as a percent)	4.75%
Estimated Fair Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Exchangeable senior debentures	$ 3,868,979	2,968,073
Mortgage Loans	313,717	399,569
Long-term Debt	6,075,148	4,870,193
Estimated Fair Value \| Global revolving credit facility
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Lines of credit	967,884	525,951
Estimated Fair Value \| Unsecured term loan
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Lines of credit	924,568	976,600
Carrying Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Exchangeable senior debentures	3,738,606	2,791,758
Mortgage Loans	303,183	378,818
Long-term Debt	5,934,241	4,673,127
Carrying Value \| Global revolving credit facility
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Lines of credit	967,884	525,951
Carrying Value \| Unsecured term loan
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Lines of credit	$ 924,568	$ 976,600

Fair value portion of borrowing which can be exchanged for a specified number of another security at the option of the issuer or the holder, for example, but not limited to, the entity's common stock.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Convertible Security
-URI http://asc.fasb.org/extlink&oid=6509036

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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

Fair value portion of contractual arrangement with a lender under which borrowings can be made up to a specific amount at any point in time.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Line-of-Credit Arrangement
-URI http://asc.fasb.org/extlink&oid=6517033

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- Definition

Fair value portion of contractual obligation to pay money on demand or on fixed or determinable dates.

+ References

No definition available.

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- Definition

The fair value amount of long-term debt whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission.

+ References

No definition available.

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