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Fair Value of Financial Instruments (Tables) | 9 Months Ended
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Sep. 30, 2018
Fair Value Disclosures [Abstract] |
Estimated Fair Value And Carrying Amounts | As of September 30, 2018 and December 31, 2017, the aggregate estimated fair value and carrying value of our global revolving credit facility, unsecured term loans, unsecured senior notes and mortgage loans were as follows (in thousands):
| Categorization under the fair value hierarchy |  | As of September 30, 2018 |  | As of December 31, 2017
| Estimated Fair Value |  | Carrying Value |  | Estimated Fair Value |  | Carrying Value
Global revolving credit facility (1)(5) | Level 2 |  | $ | 594,983 |  |  | $ | 594,983 |  |  | $ | 558,191 |  |  | $ | 558,191 |
Unsecured term loans (2)(6) | Level 2 |  | 1,356,702 |  |  | 1,356,702 |  |  | 1,425,117 |  |  | 1,425,117 |
Unsecured senior notes (3)(4)(7) | Level 2 |  | 7,280,877 |  |  | 7,168,825 |  |  | 6,976,603 |  |  | 6,608,545 |
Mortgage loans (3)(8) | Level 2 |  | 106,424 |  |  | 106,101 |  |  | 106,523 |  |  | 106,611 |
|  |  | $ | 9,338,986 |  |  | $ | 9,226,611 |  |  | $ | 9,066,434 |  |  | $ | 8,698,464 |
(1) | The carrying value of our global revolving credit facility approximates estimated fair value, due to the variability of interest rates and the stability of our credit ratings.
(2) | The carrying value of our unsecured term loans approximates estimated fair value, due to the variability of interest rates and the stability of our credit ratings.
(3) | Valuations for our unsecured senior notes and mortgage loans are determined based on the expected future payments discounted at risk-adjusted rates. The 2019 Notes, 5.875% 2020 Notes, 3.400% 2020 Notes, 2021 Notes, 3.950% 2022 Notes, 3.625% 2022 Notes, 4.750% 2023 Notes, 2.750% 2023 Notes, 2.625% 2024 Notes, 2.750% 2024 Notes, 4.750% 2025 Notes, 4.250% 2025 Notes, 2027 Notes, 2028 Notes and 2029 Notes are valued based on quoted market prices.
(4) | The carrying value of the 5.875% 2020 Notes, 3.400% 2020 Notes, 2021 Notes, 3.625% 2022 Notes, 3.950% 2022 Notes, 4.750% 2023 Notes, 2.750% 2023 Notes, 2.625% 2024 Notes, 2.750% 2024 Notes, 4.250% 2025 Notes, 2027 Notes, 2028 Notes and 2029 Notes are net of discount of $16.5 million and $18.5 million in the aggregate as of September 30, 2018 and December 31, 2017, respectively.
(5) | The estimated fair value and carrying value are exclusive of deferred financing costs of $4.7 million and $7.2 million as of September 30, 2018 and December 31, 2017, respectively.
(6) | The estimated fair value and carrying value are exclusive of deferred financing costs of $3.7 million and $4.8 million as of September 30, 2018 and December 31, 2017, respectively.
(7) | The estimated fair value and carrying value are exclusive of deferred financing costs of $38.3 million and $37.8 million as of September 30, 2018 and December 31, 2017, respectively.
(8) | The estimated fair value and carrying value are exclusive of deferred financing costs of $0.0 million and $0.0 million as of September 30, 2018 and December 31, 2017, respectively.

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- Definition Tabular disclosure of the fair value of financial instruments, including financial assets and financial liabilities, and the measurements of those instruments, assets, and liabilities. + References Reference 1: 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=77997519&loc=d3e13476-108611 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=77997519&loc=d3e13467-108611 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=75026489&loc=d3e13220-108610 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 30 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=75031198&loc=d3e14172-108612 Reference 6: 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=77997519&loc=d3e13433-108611 + Details
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