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Debt Obligations, net (Secured Credit Facility Narrative) (Details) | 1 Months Ended | 3 Months Ended | 7 Months Ended |  |
--- | --- | --- | --- | --- | ---
Mar. 31, 2017 USD ($) property lease | Jan. 31, 2017 USD ($) | Dec. 31, 2016 USD ($) property | Mar. 31, 2015 USD ($) | Mar. 31, 2017 USD ($) | Dec. 31, 2016 USD ($) | Apr. 14, 2017 | Aug. 31, 2016 USD ($)
2017 Secured Financing |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |
Debt instrument, face amount | $ 227,000,000 |  |  |  | $ 227,000,000 |  |  |
Stated interest rates (as a percent) | 3.795% |  |  |  | 3.795% |  |  |
Number of properties collateralizing loan | property | 12 |  |  |  |  |  |  |
Number of ground net leases collateralizing loan | lease | 7 |  |  |  |  |  |  |
Number of master lease collateralizing loan | lease | 1 |  |  |  |  |  |  |
Number of properties covered under master lease agreement | property | 5 |  |  |  |  |  |  |
Deferred financing costs | $ 7,400,000 |  |  |  | $ 7,400,000 |  |  |
2016 Senior Secured Credit Facility |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |
Debt instrument, face amount |  |  | $ 450,000,000.0 |  |  | $ 450,000,000.0 |  | $ 500,000,000.0
Percentage of par credit facilities were issued at | 99.00% |  |  |  | 99.00% |  |  |
Basis point spread on variable interest rate (as a percent) |  |  |  |  | 1.00% |  |  |
Multiple of the minimum collateral coverage on outstanding borrowings (at least) | 1.25 |  |  |  | 1.25 |  |  |
Required quarterly principal payment (as a percent) |  |  |  |  | 0.25% |  |  |
Deferred finance costs, gross |  |  |  |  |  | 4,500,000 |  |
Debt instrument, thirst party fees, amount recognized |  |  |  |  |  | 6,200,000 |  |
Debt issuance fees |  | $ 800,000 |  |  |  |  |  |
Debt instrument, third party fees, amount capitalized |  |  |  |  |  | 4,300,000 |  |
2016 Senior Secured Credit Facility | Other Expense |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |
Debt instrument, thirst party fees, amount recognized |  |  |  |  |  | $ 1,900,000 |  |
2016 Senior Secured Credit Facility | London Interbank Offered Rate (LIBOR) |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |
Basis point spread on variable interest rate (as a percent) |  |  |  |  | 3.75% | 4.50% |  |
2016 Senior Secured 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% | 1.00% |  |
2016 Senior Secured Credit Facility | London Interbank Offered Rate (LIBOR) | Maximum |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |
Basis point spread on variable interest rate (as a percent) |  |  |  |  | 2.75% |  |  |
2015 $250 Million Secured Revolving Credit Facility |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |
Debt instrument, face amount | $ 250,000,000 |  |  |  | $ 250,000,000 |  |  |
Multiple of the minimum collateral coverage on outstanding borrowings (at least) | 1.5 |  |  |  | 1.5 |  |  |
Line of credit facility, maximum borrowing capacity | $ 236,000,000 |  |  | $ 250,000,000.0 | $ 236,000,000 |  |  |
Interest rate during period |  |  |  |  | 3.46% |  |  |
Converted term loan, term |  |  |  |  | 1 year |  |  |
2015 $250 Million Secured Revolving Credit Facility | Minimum |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |
Commitment fee percentage |  |  |  | 0.375% |  |  |  |
2015 $250 Million Secured Revolving Credit Facility | Maximum |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |
Commitment fee percentage |  |  |  | 0.50% |  |  |  |
2015 $250 Million Secured Revolving Credit Facility | London Interbank Offered Rate (LIBOR) |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |
Basis point spread on variable interest rate (as a percent) |  |  |  |  | 2.75% |  |  |
2015 $250 Million Secured 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% |  |  |
2016 Secured Term Loan | Secured Debt |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |
Debt instrument, face amount |  |  | $ 170,000,000.0 |  |  | $ 170,000,000.0 |  |
Number of properties collateralizing loan | property |  |  | 12 |  |  |  |  |
Subsequent Event | Safety, Income nad Growth, Inc. |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |
Noncontrolling interest (as a percent) |  |  |  |  |  |  | 49.00% |

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