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Derivative Instruments (Narrative) (Details) - Not Designated as Hedging Instrument - USD ($) | Sep. 30, 2016 | Dec. 31, 2015
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Other Assets |  |
Derivative [Line Items] |  |
Derivative Asset | $ 6,382,000 | $ 5,306,000
Interest Rate Futures | Other Assets |  |
Derivative [Line Items] |  |
Derivative Asset | 1,136,000 | 122,000
Interest Rate Futures | Long |  |
Derivative [Line Items] |  |
Derivative, Notional Amount | 952,300,000 | 1,000,000,000
Interest Rate Futures | Short |  |
Derivative [Line Items] |  |
Derivative, Notional Amount | 772,500,000 | 1,100,000,000
Foreign Currency Forward Contracts, Underwriting and Non-investment Operations | Other Assets |  |
Derivative [Line Items] |  |
Derivative Asset | 4,169,000 | 4,563,000
Foreign Currency Forward Contracts, Underwriting and Non-investment Operations | Long |  |
Derivative [Line Items] |  |
Derivative, Notional Amount | 205,100,000 | 172,400,000
Foreign Currency Forward Contracts, Underwriting and Non-investment Operations | Short |  |
Derivative [Line Items] |  |
Derivative, Notional Amount | 150,700,000 | 101,500,000
Foreign Currency Forward Contracts, Investment Operations | Other Assets |  |
Derivative [Line Items] |  |
Derivative Asset | 76,000 | 408,000
Foreign Currency Forward Contracts, Investment Operations | Long |  |
Derivative [Line Items] |  |
Derivative, Notional Amount | 30,100,000 | 31,300,000
Foreign Currency Forward Contracts, Investment Operations | Short |  |
Derivative [Line Items] |  |
Derivative, Notional Amount | 62,000,000 | 143,400,000
Credit Default Swaps | Other Assets |  |
Derivative [Line Items] |  |
Derivative Asset | 1,001,000 | 213,000
Credit Default Swaps | Long |  |
Derivative [Line Items] |  |
Derivative, Notional Amount | 0 | 0
Credit Default Swaps | Short |  |
Derivative [Line Items] |  |
Derivative, Notional Amount | $ 45,700,000 | $ 46,100,000

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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=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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