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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 | 6 Months Ended
--- | ---
Jun. 30, 2018 | Jun. 30, 2017
CASH FLOWS FROM OPERATING ACTIVITIES: |  |
Amortization of discounts and premiums on debt | $ 3,263 | $ 1,391
Net (gain) loss on debt extinguishment | 22,110 | 12,258
Net cash provided by operating activities | 685,454 | 559,113
CASH FLOWS FROM INVESTING ACTIVITIES: |  |
Net cash provided by (used for) investing activities | (84,176) | (44,607)
CASH FLOWS FROM FINANCING ACTIVITIES: |  |
Commercial paper proceeds | 4,766,050 | 2,610,863
Net cash (used for) financing activities | (613,163) | (420,481)
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 | 34,507 | 37,719
Cash and cash equivalents and restricted deposits, end of period | 88,877 | 313,113
Scenario, Previously Reported [Member] |  |
CASH FLOWS FROM OPERATING ACTIVITIES: |  |
Amortization of discounts and premiums on debt |  | 3,359
(Increase) decrease in deposits - restricted |  | 310
(Increase) decrease in mortgage deposits |  | 900
Net cash provided by operating activities |  | 550,033
CASH FLOWS FROM INVESTING ACTIVITIES: |  |
(Increase) decrease in deposits on real estate acquisitions and investments, net |  | (177,742)
(Increase) decrease in mortgage deposits |  | (4,108)
Net cash provided by (used for) investing activities |  | (226,457)
CASH FLOWS FROM FINANCING ACTIVITIES: |  |
Mortgage deposits |  | 47,127
Commercial paper proceeds |  | 2,608,895
Net cash (used for) financing activities |  | (363,064)
Cash and cash equivalents, beginning of period |  | 77,207
Cash and cash equivalents, end of period |  | 37,719
Reclassification Adjustments [Member] |  |
CASH FLOWS FROM OPERATING ACTIVITIES: |  |
Amortization of discounts and premiums on debt |  | (1,968)
Net (gain) loss on debt extinguishment |  | 12,258
(Increase) decrease in deposits - restricted |  | (310)
(Increase) decrease in mortgage deposits |  | (900)
Net cash provided by operating activities |  | 9,080
CASH FLOWS FROM INVESTING ACTIVITIES: |  |
(Increase) decrease in deposits on real estate acquisitions and investments, net |  | 177,742
(Increase) decrease in mortgage deposits |  | 4,108
Net cash provided by (used for) investing activities |  | 181,850
CASH FLOWS FROM FINANCING ACTIVITIES: |  |
Mortgage deposits |  | (47,127)
Commercial paper proceeds |  | 1,968
Net cash (used for) financing activities |  | (57,417)
(adjustments for restricted deposits, beginning of period) |  | 141,881
(adjustments for restricted deposits, end of period) |  | 275,394
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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