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Debt - Summary of Consolidated Indebtedness (Parenthetical) (Details) - USD ($) $ in Thousands | 6 Months Ended |
--- | --- | ---
Jun. 30, 2019 | Dec. 31, 2018
Debt Instrument [Line Items] |  |
Long-term debt, gross | $ 1,695,702 | $ 1,560,333
Variable-rate debt that subject to interest cap agreements |  |
Debt Instrument [Line Items] |  |
Long-term debt, gross | 157,500 | 143,800
Interest Rate Swaps | Not Designated |  |
Debt Instrument [Line Items] |  |
Long-term debt, gross | 165,500 |
Total Debt - Variable Rate Debt Fixed with Interest Rate Swap Agreements |  |
Debt Instrument [Line Items] |  |
Long-term debt, gross | $ 691,400 | $ 609,900
Minimum | Core Portfolio | Variable Rate Debt | LIBOR |  |
Debt Instrument [Line Items] |  |
Basis spread on variable rate | 1.50% |
Minimum | Core Portfolio | Unsecured Notes Payable | LIBOR |  |
Debt Instrument [Line Items] |  |
Basis spread on variable rate | 1.25% |
Minimum | Core Portfolio | Unsecured Line of Credit | LIBOR |  |
Debt Instrument [Line Items] |  |
Basis spread on variable rate | 1.35% |
Maximum | Core Portfolio | Variable Rate Debt | LIBOR |  |
Debt Instrument [Line Items] |  |
Basis spread on variable rate | 1.90% |
Fund II | Fund Portfolio |  |
Debt Instrument [Line Items] |  |
Long-term debt, gross | $ 23,598 |
Fund II | Fund Portfolio | Variable Rate Debt | LIBOR |  |
Debt Instrument [Line Items] |  |
Basis spread on variable rate | 1.39% |
Fund III | Minimum | Fund Portfolio | Variable Rate Debt | LIBOR |  |
Debt Instrument [Line Items] |  |
Basis spread on variable rate | 2.65% |
Fund III | Maximum | Fund Portfolio | Variable Rate Debt | LIBOR |  |
Debt Instrument [Line Items] |  |
Basis spread on variable rate | 4.65% |
Fund IV | Minimum | Fund Portfolio | LIBOR |  |
Debt Instrument [Line Items] |  |
Basis spread on variable rate | 1.60% |
Fund IV | Maximum | Fund Portfolio | LIBOR |  |
Debt Instrument [Line Items] |  |
Basis spread on variable rate | 3.40% |
Fund V | Minimum | Fund Portfolio | LIBOR |  |
Debt Instrument [Line Items] |  |
Basis spread on variable rate | 2.15% |
Fund V | Maximum | Fund Portfolio | LIBOR |  |
Debt Instrument [Line Items] |  |
Basis spread on variable rate | 2.25% |

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- Definition Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (b)(1) -URI http://asc.fasb.org/extlink&oid=109500613&loc=SL6031897-161870 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(16)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 3: 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(22)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -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 + Details
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