Investments - Narrative (Details) $ in Millions |
Jun. 30, 2019
USD ($)
Property
State
Note
|
Dec. 31, 2018
Property
|
|---|---|---|
| Investment [Line Items] | ||
| Gross investment in real estate properties and loans | $ | $ 5,400.0 | |
| Number of real estate properties | Property | 1,606 | |
| Portfolio disbursement, number of states | State | 48 | |
| Minimum of investment in real estate properties | 10.00% | |
| Number of properties under operating leases | Property | 1,560 | 1,458 |
| Number of other notes receivable | Note | 2 | |
| Number of other notes receivable, secured | Note | 1 | |
| Secured Debt | ||
| Investment [Line Items] | ||
| Other notes receivable | $ | $ 0.1 | |
| Unsecured Debt | ||
| Investment [Line Items] | ||
| Other notes receivable | $ | $ 1.9 | |
| Financed Real Estate | ||
| Investment [Line Items] | ||
| Number of real estate properties | Property | 43 | |
| Texas | ||
| Investment [Line Items] | ||
| Investment in real estate properties | 11.90% |