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Fair Value of Financial Instruments (Estimated Fair Value And Carrying Amounts) (Details) - USD ($) $ in Thousands | Sep. 30, 2018 | Dec. 31, 2017
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5.875% notes due 2020 |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Stated interest rate | 5.875% |
3.400% notes due 2020 |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Stated interest rate | 3.40% |
3.950% notes due 2022 |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Stated interest rate | 3.95% |
3.625% notes due 2022 |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Stated interest rate | 3.625% |
4.750% notes due 2023 |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Stated interest rate | 4.75% |
2.750% notes due 2023 |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Stated interest rate | 2.75% |
2.625% notes due 2024 |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Stated interest rate | 2.625% |
2.750% notes due 2024 |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Stated interest rate | 2.75% |
4.750% notes due 2025 |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Stated interest rate | 4.75% |
4.250% notes due 2025 |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Stated interest rate | 4.25% |
Estimated Fair Value |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Fair value of long-term debt | $ 9,338,986 | $ 9,066,434
Carrying Value |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Fair value of long-term debt | 9,226,611 | 8,698,464
Global revolving credit facility, net |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Deferred financing costs | 4,700 | 7,200
Unsecured Term Loans |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Deferred financing costs | 3,700 | 4,800
Unsecured Senior Notes |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Fair value of long-term debt | 16,500 | 18,500
Deferred financing costs | $ 38,300 | 37,800
Unsecured Senior Notes | 3.400% notes due 2020 |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Stated interest rate | 3.40% |
Unsecured Senior Notes | 3.950% notes due 2022 |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Stated interest rate | 3.95% |
Unsecured Senior Notes | 3.625% notes due 2022 |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Stated interest rate | 3.625% |
Unsecured Senior Notes | 2.625% notes due 2024 |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Stated interest rate | 2.625% |
Unsecured Senior Notes | 2.750% notes due 2024 |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Stated interest rate | 2.75% |
Unsecured Senior Notes | 4.750% notes due 2025 |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Stated interest rate | 4.75% |
Mortgage Loans |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Deferred financing costs | $ 0 | 0
Level 2 | Global revolving credit facility, net | Estimated Fair Value |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Lines of credit | 594,983 | 558,191
Level 2 | Global revolving credit facility, net | Carrying Value |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Lines of credit | 594,983 | 558,191
Level 2 | Unsecured Term Loans | Estimated Fair Value |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Lines of credit | 1,356,702 | 1,425,117
Level 2 | Unsecured Term Loans | Carrying Value |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Lines of credit | 1,356,702 | 1,425,117
Level 2 | Unsecured Senior Notes | Estimated Fair Value |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Unsecured senior notes | 7,280,877 | 6,976,603
Level 2 | Unsecured Senior Notes | Carrying Value |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Unsecured senior notes | 7,168,825 | 6,608,545
Level 2 | Mortgage Loans | Estimated Fair Value |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Mortgage Loans | 106,424 | 106,523
Level 2 | Mortgage Loans | Carrying Value |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Mortgage Loans | $ 106,101 | $ 106,611

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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 + Details
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- Definition Amount, after accumulated amortization, of debt issuance costs. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=64930785&loc=d3e28555-108399 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 210.5-02.17) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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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. + Details
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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. + Details
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