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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 | 3 Months Ended
--- | ---
Mar. 31, 2018 | Mar. 31, 2017
CASH FLOWS FROM OPERATING ACTIVITIES: |  |
Amortization of discounts and premiums on debt | $ 1,532 | $ 1,130
Net (gain) loss on debt extinguishment | 22,110 | 11,698
Net cash provided by operating activities | 361,018 | 303,904
CASH FLOWS FROM INVESTING ACTIVITIES: |  |
Net cash provided by (used for) investing activities | 147,298 | (72,642)
CASH FLOWS FROM FINANCING ACTIVITIES: |  |
Commercial paper proceeds | 1,107,561 | 1,310,188
Net cash (used for) financing activities | (514,367) | (264,127)
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 | 44,453 | 42,139
Cash and cash equivalents and restricted deposits, end of period | 94,711 | 186,223
Mortgage Notes Payable, Net [Member] |  |
CASH FLOWS FROM FINANCING ACTIVITIES: |  |
Mortgage notes payable, net: Net gain (loss) on debt extinguishment | $ (22,110) | (11,698)
Scenario, Previously Reported [Member] |  |
CASH FLOWS FROM OPERATING ACTIVITIES: |  |
Amortization of discounts and premiums on debt |  | 1,637
(Increase) decrease in deposits - restricted |  | 256
(Increase) decrease in mortgage deposits |  | 315
Net cash provided by operating activities |  | 293,284
CASH FLOWS FROM INVESTING ACTIVITIES: |  |
(Increase) decrease in deposits on real estate acquisitions and investments, net |  | 637
(Increase) decrease in mortgage deposits |  | (1,030)
Net cash provided by (used for) investing activities |  | (73,035)
CASH FLOWS FROM FINANCING ACTIVITIES: |  |
Mortgage deposits |  | (2,381)
Commercial paper proceeds |  | 1,309,681
Net cash (used for) financing activities |  | (255,317)
Cash and cash equivalents, beginning of period |  | 77,207
Cash and cash equivalents, end of period |  | 42,139
Reclassification Adjustments [Member] |  |
CASH FLOWS FROM OPERATING ACTIVITIES: |  |
Amortization of discounts and premiums on debt |  | (507)
Net (gain) loss on debt extinguishment |  | 11,698
(Increase) decrease in deposits - restricted |  | (256)
(Increase) decrease in mortgage deposits |  | (315)
Net cash provided by operating activities |  | 10,620
CASH FLOWS FROM INVESTING ACTIVITIES: |  |
(Increase) decrease in deposits on real estate acquisitions and investments, net |  | (637)
(Increase) decrease in mortgage deposits |  | 1,030
Net cash provided by (used for) investing activities |  | 393
CASH FLOWS FROM FINANCING ACTIVITIES: |  |
Mortgage deposits |  | 2,381
Commercial paper proceeds |  | 507
Net cash (used for) financing activities |  | (8,810)
(adjustments for restricted deposits, beginning of period) |  | 141,881
(adjustments for restricted deposits, end of period) |  | 144,084
Reclassification Adjustments [Member] | Mortgage Notes Payable, Net [Member] |  |
CASH FLOWS FROM FINANCING ACTIVITIES: |  |
Mortgage notes payable, net: Net gain (loss) on debt extinguishment |  | $ (11,698)

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