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Debt Obligations, net (Secured Credit Facility Narrative) (Details) | 1 Months Ended | 3 Months Ended | 6 Months Ended | 9 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Jun. 30, 2018 USD ($) | Sep. 30, 2017 USD ($) | Mar. 31, 2017 USD ($) property | Sep. 30, 2018 USD ($) | Sep. 30, 2017 USD ($) | Jun. 30, 2018 USD ($) | Sep. 30, 2018 USD ($) | Sep. 30, 2017 USD ($) | Aug. 31, 2016 USD ($) | Jun. 30, 2016 USD ($) | Mar. 31, 2015 USD ($)
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |
Loss on early extinguishment of debt, net |  |  |  | $ 911,000 | $ 616,000 |  | $ 3,447,000 | $ 4,142,000 |  |  |
2017 Secured Financing | Safety, Income and Growth, Inc. |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |
Equity capitalization amount, at least |  |  |  | 500,000,000 |  |  | 500,000,000 |  |  |  |
Net worth, at least |  |  |  | 250,000,000 |  |  | $ 250,000,000 |  |  |  |
2016 Senior Term Loan |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |
Debt instrument, face amount | $ 650,000,000.0 | $ 400,000,000.0 |  |  | 400,000,000.0 | $ 650,000,000.0 |  | 400,000,000.0 | $ 500,000,000.0 | $ 450,000,000.0 |
Percentage of par credit facilities were issued at |  |  |  |  |  |  |  |  |  | 99.00% |
Basis point spread on variable interest rate (as a percent) |  |  |  |  |  |  | 1.00% |  |  |  |
Required quarterly principal payment (as a percent) |  |  |  |  |  | 0.25% |  |  |  |  |
2016 Senior Term Loan | Other Expense |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |
Loss on early extinguishment of debt, net |  |  |  |  |  |  | $ 2,500,000 |  |  |  |
2016 Senior Term Loan | London Interbank Offered Rate (LIBOR) |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |
Basis point spread on variable interest rate (as a percent) | 2.75% | 3.00% |  |  |  |  | 2.75% |  |  |  |
2016 Senior Term Loan | London Interbank Offered Rate (LIBOR) | Minimum |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |
Basis point spread on variable interest rate (as a percent) |  | 0.75% |  |  |  |  |  |  |  |  |
2016 Senior Term Loan | London Interbank Offered Rate (LIBOR) | Maximum |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |
Basis point spread on variable interest rate (as a percent) |  |  |  |  |  |  | 1.75% |  |  |  |
2015 $325 million Revolving Credit Facility |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |
Line of credit facility, maximum borrowing capacity |  | $ 325,000,000 |  | $ 325,000,000 | $ 325,000,000 |  | $ 325,000,000 | $ 325,000,000 |  |  | $ 250,000,000.0
Converted term loan, term |  |  |  |  |  |  | 1 year |  |  |  |
Repayments of credit facility |  |  |  |  |  |  | $ 325,000,000 |  |  |  |
2015 $325 million Revolving Credit Facility | Minimum |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |
Commitment fee percentage |  |  |  |  |  |  | 0.30% |  |  |  |
2015 $325 million Revolving Credit Facility | Maximum |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |
Commitment fee percentage |  |  |  |  |  |  | 0.50% |  |  |  |
2015 $325 million Revolving Credit Facility | London Interbank Offered Rate (LIBOR) |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |
Basis point spread on variable interest rate (as a percent) |  |  |  |  |  |  | 2.50% |  |  |  |
2015 $325 million Revolving Credit Facility | London Interbank Offered Rate (LIBOR) | Minimum |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |
Basis point spread on variable interest rate (as a percent) |  |  |  |  |  |  | 1.00% |  |  |  |
2017 Secured Financing |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |
Debt instrument, face amount |  |  | $ 227,000,000.0 |  |  |  |  |  |  |  |
Stated interest rates (as a percent) |  |  | 3.795% |  |  |  |  |  |  |  |
Number of properties collateralizing loan | property |  |  | 12 |  |  |  |  |  |  |  |
Deferred financing costs |  |  | $ 7,300,000 |  |  |  |  |  |  |  |

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