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Summary of Significant Accounting Policies - Schedule of Material Changes Between Cash Flow Classifications due to Substantial Debt Prepayment Penalties (Details) - USD ($) $ in Thousands | 9 Months Ended
--- | ---
Sep. 30, 2018 | Sep. 30, 2017
CASH FLOWS FROM OPERATING ACTIVITIES: |  |
Amortization of discounts and premiums on debt | $ 21,360 | $ 2,018
Net (gain) loss on debt extinguishment | 22,110 | 12,258
Net cash provided by operating activities | 1,044,191 | 970,136
CASH FLOWS FROM INVESTING ACTIVITIES: |  |
Net cash provided by (used for) investing activities | (268,820) | (515,775)
CASH FLOWS FROM FINANCING ACTIVITIES: |  |
Commercial paper proceeds | 9,624,610 | 3,891,596
Net cash (used for) financing activities | (787,383) | (579,273)
Cash and cash equivalents, beginning of period | 50,647 |
Cash and cash equivalents and restricted deposits, beginning of period | 100,762 | 219,088
Cash and cash equivalents, end of period | 32,995 | 46,565
Cash and cash equivalents and restricted deposits, end of period | 88,750 | 94,176
Scenario, Previously Reported [Member] |  |
CASH FLOWS FROM OPERATING ACTIVITIES: |  |
Amortization of discounts and premiums on debt |  | 4,939
(Increase) decrease in deposits - restricted |  | 788
(Increase) decrease in mortgage deposits |  | 1,447
Net cash provided by operating activities |  | 963,034
CASH FLOWS FROM INVESTING ACTIVITIES: |  |
(Increase) decrease in deposits on real estate acquisitions and investments, net |  | 39,519
(Increase) decrease in mortgage deposits |  | (4,541)
Net cash provided by (used for) investing activities |  | (480,797)
CASH FLOWS FROM FINANCING ACTIVITIES: |  |
Mortgage deposits |  | 57,057
Commercial paper proceeds |  | 3,888,675
Net cash (used for) financing activities |  | (512,879)
Cash and cash equivalents, beginning of period |  | 77,207
Cash and cash equivalents, end of period |  | 46,565
Reclassification Adjustments [Member] |  |
CASH FLOWS FROM OPERATING ACTIVITIES: |  |
Amortization of discounts and premiums on debt |  | (2,921)
Net (gain) loss on debt extinguishment |  | 12,258
(Increase) decrease in deposits - restricted |  | (788)
(Increase) decrease in mortgage deposits |  | (1,447)
Net cash provided by operating activities |  | 7,102
CASH FLOWS FROM INVESTING ACTIVITIES: |  |
(Increase) decrease in deposits on real estate acquisitions and investments, net |  | (39,519)
(Increase) decrease in mortgage deposits |  | 4,541
Net cash provided by (used for) investing activities |  | (34,978)
CASH FLOWS FROM FINANCING ACTIVITIES: |  |
Mortgage deposits |  | (57,057)
Commercial paper proceeds |  | 2,921
Net cash (used for) financing activities |  | (66,394)
(adjustments for restricted deposits, beginning of period) |  | 141,881
(adjustments for restricted deposits, end of period) |  | 47,611
Mortgage Notes Payable, Net [Member] |  |
CASH FLOWS FROM FINANCING ACTIVITIES: |  |
Mortgage notes payable, net: Net gain (loss) on debt extinguishment | $ (22,110) | (12,258)
Mortgage Notes Payable, Net [Member] | Reclassification Adjustments [Member] |  |
CASH FLOWS FROM FINANCING ACTIVITIES: |  |
Mortgage notes payable, net: Net gain (loss) on debt extinguishment |  | $ (12,258)

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