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Debt - Unsecured Term Loans (Details) - USD ($) | 1 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Jun. 30, 2016 | Jan. 31, 2016 | Dec. 31, 2016 | Dec. 31, 2015
Debt Instrument [Line Items] |  |  |  |
Total indebtedness |  |  | $ 1,488,718,000 | $ 1,358,606,000
Unsecured Debt [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Total indebtedness |  |  | 9,900,000 | $ 15,500,000
Unsecured Debt [Member] | Term Loan Four [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Total indebtedness |  | $ 50,000,000 |  |
Line of Credit [Member] | Term Loan [Member] | Term Loan One [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Proceeds from (repayments of) lines of credit | $ (50,000,000) |  |  |
Line of Credit [Member] | Term Loan [Member] | Term Loan Five [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Maximum borrowing capacity | $ 150,000,000 |  |  |
Fund IV [Member] | Line of Credit [Member] | Fund IV Term Loan [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long-term line of credit, noncurrent |  |  | 40,100,000 |
Fund IV [Member] | Line of Credit [Member] | Fund IV Revolving Subscription Line [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long-term line of credit, noncurrent |  |  | 94,500,000 |
Fund IV [Member] | Line of Credit [Member] | Term Loan [Member] | Fund IV Term Loan [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Proceeds from (repayments of) lines of credit |  |  | 5,600,000 |
Fund IV [Member] | Revolving Credit Facility [Member] | Term Loan [Member] | Fund IV Revolving Subscription Line [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Proceeds from (repayments of) lines of credit |  |  | $ 2,600,000 |
London Interbank Offered Rate (LIBOR) [Member] | Unsecured Debt [Member] | Term Loan Four [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Basis spread on variable rate | 1.30% | 1.30% |  |
London Interbank Offered Rate (LIBOR) [Member] | Revolving Credit Facility [Member] | Unsecured Debt [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Basis spread on variable rate |  |  | 1.40% |

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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 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 Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(16)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 3: 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 + 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=28361426&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=28361426&loc=d3e1336-112600 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Line-of-Credit Arrangement -URI http://asc.fasb.org/extlink&oid=6517033 + Details
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- Definition The net cash inflow or cash outflow from a contractual arrangement with the lender, including letter of credit, standby letter of credit and revolving credit arrangements, under which borrowings can be made up to a specific amount at any point in time with either short term or long term maturity that is collateralized (backed by pledge, mortgage or other lien in the entity's assets). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 9 -Subparagraph c -URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3098-108585 + Details
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