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Debt - Unsecured Notes Payable (Details) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2017 USD ($) debtinstrument | Dec. 31, 2016 USD ($)
Debt Instrument [Line Items] |  |
Number of instruments held | debtinstrument | 6 |
Letters of credit, outstanding amount | $ 19,700,000 | $ 11,300,000
Unsecured Notes Payable | Unsecured Debt |  |
Debt Instrument [Line Items] |  |
Debt available balance | 70,300,000 | 9,900,000
Fund IV | Letter of Credit | Unsecured Debt |  |
Debt Instrument [Line Items] |  |
Letters of credit, outstanding amount | 7,400,000 | 0
Fund IV | Bridge facility | Unsecured Debt |  |
Debt Instrument [Line Items] |  |
Maximum borrowing capacity | 41,812,000 |
Long-term line of credit, noncurrent | 40,800,000 | 40,100,000
Remaining borrowing capacity | 1,000,000 | 0
Fund IV | Subscription Line | Unsecured Debt |  |
Debt Instrument [Line Items] |  |
Maximum borrowing capacity | 21,500,000.0 |
Long-term line of credit, noncurrent | 0 | 94,500,000
Remaining borrowing capacity | 14,100,000 | $ 5,500,000
Fund V | Subscription Line | Unsecured Debt |  |
Debt Instrument [Line Items] |  |
Maximum borrowing capacity | 150,000,000.0 |
Long-term line of credit, noncurrent | 103,300,000 |
Remaining borrowing capacity | 46,700,000 |
Fund II | Term Loan Maturing In September 2020 | Secured Debt |  |
Debt Instrument [Line Items] |  |
Maximum borrowing capacity | 40,000,000.0 |
Long-term line of credit, noncurrent | 31,500,000 |
Remaining borrowing capacity | $ 8,500,000 |
LIBOR | Fund V | Subscription Line | Unsecured Debt |  |
Debt Instrument [Line Items] |  |
Basis spread on variable rate | 1.60% |
LIBOR | Fund II | Term Loan Maturing In September 2020 | Secured Debt |  |
Debt Instrument [Line Items] |  |
Basis spread on variable rate | 1.40% |
Core Portfolio |  |
Debt Instrument [Line Items] |  |
Number of instruments held | debtinstrument | 3 |
Core Portfolio | $300 Million Term Loan | Unsecured Debt |  |
Debt Instrument [Line Items] |  |
Maximum borrowing capacity | $ 300,000,000.0 |
Core Portfolio | $150 Million Term Loan | Unsecured Debt |  |
Debt Instrument [Line Items] |  |
Maximum borrowing capacity | 150,000,000.0 |
Core Portfolio | $50 Million Term Loan | Unsecured Debt |  |
Debt Instrument [Line Items] |  |
Maximum borrowing capacity | $ 50,000,000.0 |
Number of instruments held | 3 |

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- Definition Percentage points added to the reference rate to compute the variable rate on the debt instrument. + References No definition available. + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition Amount of unused borrowing capacity under the long-term financing arrangement that is available to the entity as of the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition The total amount of the contingent obligation under letters of credit outstanding as of the reporting date. + References No definition available. + Details
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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://www.xbrl.org/2003/role/presentationRef -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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- Definition The carrying value as of the balance sheet date of the noncurrent portion of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 10 -Section 45 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=99376301&loc=d3e1314-112600 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 10 -Section 45 -Paragraph 14 -URI http://asc.fasb.org/extlink&oid=99376301&loc=d3e1336-112600 + Details
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