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Financial Instruments and Fair Value Measurements - Derivative Financial Instruments (Details) - USD ($) $ in Thousands | Mar. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Derivatives, Fair Value [Line Items] |  |
Fair value, liability derivatives | $ (1,238) | $ (1,467)
Fair value, asset derivatives | 9,958 | 4,402
Interest Rate Swaps |  |
Derivatives, Fair Value [Line Items] |  |
Aggregate Notional Amount | 50,000 |
Core Portfolio |  |
Derivatives, Fair Value [Line Items] |  |
Aggregate Notional Amount | 406,687 |
Fair value, derivatives, net | 7,220 | 2,638
Core Portfolio | Interest Rate Swaps | Other Liabilities |  |
Derivatives, Fair Value [Line Items] |  |
Aggregate Notional Amount | 69,864 |
Fair value, liability derivatives | $ (1,238) | (1,438)
Core Portfolio | Interest Rate Swaps | Other Liabilities | Minimum |  |
Derivatives, Fair Value [Line Items] |  |
Strike Rate | 2.90% |
Core Portfolio | Interest Rate Swaps | Other Liabilities | Maximum |  |
Derivatives, Fair Value [Line Items] |  |
Strike Rate | 3.77% |
Core Portfolio | Interest Rate Swaps | Other Assets |  |
Derivatives, Fair Value [Line Items] |  |
Aggregate Notional Amount | $ 336,823 |
Fair value, asset derivatives | $ 8,458 | 4,076
Core Portfolio | Interest Rate Swaps | Other Assets | Minimum |  |
Derivatives, Fair Value [Line Items] |  |
Strike Rate | 1.24% |
Core Portfolio | Interest Rate Swaps | Other Assets | Maximum |  |
Derivatives, Fair Value [Line Items] |  |
Strike Rate | 3.77% |
Fund Portfolio | Fund II |  |
Derivatives, Fair Value [Line Items] |  |
Aggregate Notional Amount | $ 49,003 |
Fair value, derivatives, net | 155 | (29)
Fund Portfolio | Fund II | Interest Rate Swaps | Other Liabilities |  |
Derivatives, Fair Value [Line Items] |  |
Aggregate Notional Amount | 0 |
Fair value, liability derivatives | $ 0 | (29)
Fund Portfolio | Fund II | Interest Rate Swaps | Other Liabilities | Minimum |  |
Derivatives, Fair Value [Line Items] |  |
Strike Rate | 2.88% |
Fund Portfolio | Fund II | Interest Rate Swaps | Other Liabilities | Maximum |  |
Derivatives, Fair Value [Line Items] |  |
Strike Rate | 2.88% |
Fund Portfolio | Fund II | Interest Rate Swaps | Other Assets |  |
Derivatives, Fair Value [Line Items] |  |
Aggregate Notional Amount | $ 19,503 |
Fair value, asset derivatives | $ 155 | 0
Fund Portfolio | Fund II | Interest Rate Swaps | Other Assets | Minimum |  |
Derivatives, Fair Value [Line Items] |  |
Strike Rate | 2.88% |
Fund Portfolio | Fund II | Interest Rate Swaps | Other Assets | Maximum |  |
Derivatives, Fair Value [Line Items] |  |
Strike Rate | 2.88% |
Fund Portfolio | Fund II | Interest Rate Cap | Other Assets |  |
Derivatives, Fair Value [Line Items] |  |
Aggregate Notional Amount | $ 29,500 |
Fair value, asset derivatives | $ 0 | 0
Fund Portfolio | Fund II | Interest Rate Cap | Other Assets | Minimum |  |
Derivatives, Fair Value [Line Items] |  |
Strike Rate | 4.00% |
Fund Portfolio | Fund II | Interest Rate Cap | Other Assets | Maximum |  |
Derivatives, Fair Value [Line Items] |  |
Strike Rate | 4.00% |
Fund Portfolio | Fund III | Interest Rate Cap | Other Assets |  |
Derivatives, Fair Value [Line Items] |  |
Aggregate Notional Amount | $ 58,000 |
Fair value, asset derivatives | $ 48 | 14
Fund Portfolio | Fund III | Interest Rate Cap | Other Assets | Minimum |  |
Derivatives, Fair Value [Line Items] |  |
Strike Rate | 3.00% |
Fund Portfolio | Fund III | Interest Rate Cap | Other Assets | Maximum |  |
Derivatives, Fair Value [Line Items] |  |
Strike Rate | 3.00% |
Fund Portfolio | Fund IV |  |
Derivatives, Fair Value [Line Items] |  |
Aggregate Notional Amount | $ 195,417 |
Fair value, derivatives, net | 1,287 | 312
Fund Portfolio | Fund IV | Interest Rate Swaps | Other Assets |  |
Derivatives, Fair Value [Line Items] |  |
Aggregate Notional Amount | 86,517 |
Fair value, asset derivatives | $ 1,222 | 295
Fund Portfolio | Fund IV | Interest Rate Swaps | Other Assets | Minimum |  |
Derivatives, Fair Value [Line Items] |  |
Strike Rate | 1.78% |
Fund Portfolio | Fund IV | Interest Rate Swaps | Other Assets | Maximum |  |
Derivatives, Fair Value [Line Items] |  |
Strike Rate | 2.11% |
Fund Portfolio | Fund IV | Interest Rate Cap | Other Assets |  |
Derivatives, Fair Value [Line Items] |  |
Aggregate Notional Amount | $ 108,900 |
Fair value, asset derivatives | $ 65 | 17
Fund Portfolio | Fund IV | Interest Rate Cap | Other Assets | Minimum |  |
Derivatives, Fair Value [Line Items] |  |
Strike Rate | 3.00% |
Fund Portfolio | Fund IV | Interest Rate Cap | Other Assets | Maximum |  |
Derivatives, Fair Value [Line Items] |  |
Strike Rate | 3.00% |
Fund Portfolio | Fund V | Interest Rate Swaps | Other Assets |  |
Derivatives, Fair Value [Line Items] |  |
Aggregate Notional Amount | $ 16,900 |
Fair value, asset derivatives | $ 10 | $ 0
Fund Portfolio | Fund V | Interest Rate Swaps | Other Assets | Minimum |  |
Derivatives, Fair Value [Line Items] |  |
Strike Rate | 2.41% |
Fund Portfolio | Fund V | Interest Rate Swaps | Other Assets | Maximum |  |
Derivatives, Fair Value [Line Items] |  |
Strike Rate | 2.41% |

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- Definition Aggregate notional amount specified by the derivative(s). Expressed as an absolute value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 12 -Section 13 -Sentence Column B + Details
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- Definition Fair value, after the effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes assets not subject to a master netting arrangement and not elected to be offset. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=51824906&loc=SL20225862-175312 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 45 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41271-113958 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=77997519&loc=d3e13433-108611 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41228-113958 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=77997519&loc=d3e13495-108611 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=82849420&loc=SL20226008-175313 + Details
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- Definition Fair value of the assets less the liabilities of a derivative or group of derivatives. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 45 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41271-113958 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41228-113958 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=77997519&loc=d3e13433-108611 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=77997519&loc=d3e13495-108611 + Details
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- Definition Fair value, after the effects of master netting arrangements, of a financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes liabilities not subject to a master netting arrangement and not elected to be offset. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=82849420&loc=SL20226008-175313 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=77997519&loc=d3e13495-108611 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=51824906&loc=SL20225862-175312 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=77997519&loc=d3e13433-108611 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 45 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41271-113958 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41228-113958 + Details
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