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Derivative Instruments (Details 2) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2016 | Dec. 31, 2015
Derivative [Line Items] |  |  |
Notional Amount |  | $ 186,100 | $ 134,700
Fair Value |  | 8,694 | 2,501
Bank of America, N.A. [Member] |  |  |
Derivative [Line Items] |  |  |
Notional Amount |  | 38,500 | 17,000
Fair Value |  | 1,934 | 5
Credit Suisse International [Member] |  |  |
Derivative [Line Items] |  |  |
Notional Amount |  | 65,200 | 12,000
Fair Value |  | 4,281 | 167
Societe Generale [Member] |  |  |
Derivative [Line Items] |  |  |
Notional Amount |  | 15,600 | 80,800
Fair Value |  | 936 | 1,347
Barclays Bank PLC [Member] |  |  |
Derivative [Line Items] |  |  |
Notional Amount |  | 66,800 | 7,600
Fair Value |  | 1,543 | 137
Citigroup Inc [Member] |  |  |
Derivative [Line Items] |  |  |
Notional Amount |  | 0 | 17,300
Fair Value |  | $ 0 | $ 845
Moody's [Member] | Bank of America, N.A. [Member] |  |  |
Derivative [Line Items] |  |  |
Credit Rating | [1] | A1 |
Moody's [Member] | Societe Generale [Member] |  |  |
Derivative [Line Items] |  |  |
Credit Rating | [1] | A2 |
Moody's [Member] | Barclays Bank PLC [Member] |  |  |
Derivative [Line Items] |  |  |
Credit Rating | [1] | A1 |
Moody's [Member] | Credit Suisse International [Member] |  |  |
Derivative [Line Items] |  |  |
Credit Rating | [1] | A1 |
Moody's [Member] | Citigroup Inc [Member] |  |  |
Derivative [Line Items] |  |  |
Credit Rating | [1] | Baa1 |
Standard & Poor's [Member] | Bank of America, N.A. [Member] |  |  |
Derivative [Line Items] |  |  |
Credit Rating | [1] | A+ |
Standard & Poor's [Member] | Credit Suisse International [Member] |  |  |
Derivative [Line Items] |  |  |
Credit Rating | [1] | A |
Standard & Poor's [Member] | Societe Generale [Member] |  |  |
Derivative [Line Items] |  |  |
Credit Rating | [1] | A |
Standard & Poor's [Member] | Barclays Bank PLC [Member] |  |  |
Derivative [Line Items] |  |  |
Credit Rating | [1] | A- |
Standard & Poor's [Member] | Citigroup Inc [Member] |  |  |
Derivative [Line Items] |  |  |
Credit Rating | [1] | BBB+ |
[1] | As assigned by Standard & Poor’s Corporation (“S&P”) and Moody’s Investors Service, Inc. (“Moody’s”).

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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 Description of the credit rating indicative of likelihood of repayment of the debt instrument given by a credit rating agency (for example, Standard and Poor's, Moody's, Fitch). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21475-112644 Reference 2: 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 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=73719730&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=73719730&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=51825145&loc=SL20226008-175313 + Details
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