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Credit Facilities - Credit Facility (Details) - Credit Facility - KeyBank National Association - Unsecured debt | Jul. 02, 2018 USD ($) | Jul. 24, 2017 USD ($) extension | Sep. 30, 2018 EUR (€) | Sep. 30, 2018 USD ($) | Jun. 30, 2018 USD ($)
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Line of Credit Facility [Line Items] |  |  |  |  |
Maximum borrowing capacity (up to) | $ 914,400,000 | $ 725,000,000 |  |  | $ 722,200,000
Increase in aggregate commitments (up to) | 35,631,000 |  |  |  |
Total line of credit commitment | 950,000,000 |  |  |  |
Number of extensions (extension) | extension |  | 1 |  |  |
Extension term |  | 1 year |  |  |
Weighted-average effective interest rate |  |  | 3.00% | 3.00% |
Available for future borrowings |  |  |  | $ 7,000,000 |
Federal Funds |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Interest rate spread |  | 0.50% |  |  |
LIBOR |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Interest rate spread |  | 1.00% |  |  |
LIBOR | Minimum |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Interest rate spread |  | 1.60% |  |  |
LIBOR | Maximum |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Interest rate spread |  | 2.20% |  |  |
Base Rate | Minimum |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Interest rate spread |  | 0.60% |  |  |
Base Rate | Maximum |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Interest rate spread |  | 1.20% |  |  |
Revolving Credit Facility |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Maximum borrowing capacity (up to) |  |  |  | 632,000,000 |
Increase in maximum borrowing capacity | 132,000,000 |  |  |  |
Facility fee multiplier |  | 0.003 |  |  |
Revolving Credit Facility | Above Threshold |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Unused capacity commitment fee |  | 0.25% |  |  |
Commitment fee percentage |  | 50.00% |  |  |
Revolving Credit Facility | Below Threshold |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Unused capacity commitment fee |  | 0.15% |  |  |
Commitment fee percentage |  | 50.00% |  |  |
Term Facility |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Maximum borrowing capacity (up to) |  |  | € 246,481,489.42 | $ 286,764,698.68037886 |
Increase in maximum borrowing capacity | $ 60,200,000 |  |  |  |

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- Definition Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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