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Derivative Instruments (Derivative Instruments Offsetting Balance Sheet) (Details) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2013 | Dec. 31, 2012
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Derivative Asset [Abstract] |  |  |  |
Derivative Asset, Fair Value, Gross Asset | $ 101,352 |  | $ 190,634 |
Derivative Asset, Fair Value, Gross Liability | (26,125) |  | (22,426) |
Derivative Asset | 75,227 |  | 168,208 |
Derivative Asset, Fair Value of Collateral | (11,095) | [1] | (22,458) | [1]
Derivative, Collateral, Obligation to Return Cash | (51,006) | [2] | (136,414) | [2]
Derivative Asset, Fair Value, Amount Offset Against Collateral | 13,126 |  | 9,336 |
Derivative Liability [Abstract] |  |  |  |
Derivative Fair Value Of Free Standing Derivative Liability | 42,336 |  | 54,078 |
Derivative Liability, Fair Value, Gross Asset | (26,125) |  | (22,426) |
Derivative Liability | 16,211 |  | 31,652 |
Derivative Liability, Fair Value of Collateral | (18,081) | [3] | (1,565) | [3]
Derivative, Collateral, Right to Reclaim Cash | (8,033) | [4] | (27,867) | [4]
Derivative Liability, Fair Value, Amount Offset Against Collateral | $ (9,903) |  | $ 2,220 |
[1] | Consists of U.S. Treasury securities.
[2] | Included in cash and cash equivalents, with obligation to return cash collateral recorded in other liabilities.
[3] | Included in other invested assets, primarily consists of U.S. Treasury securities.
[4] | Consists of receivable from counterparty, included in other assets.

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- Definition Fair value of liability associated with 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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=28370219&loc=SL20226003-175313 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=20225523&loc=SL20225862-175312 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4B -Subparagraph (a),(c) -URI http://asc.fasb.org/extlink&oid=7476318&loc=SL5624163-113959 + Details
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- Definition Amount of obligation to return cash collateral under master netting arrangements that have not been offset against derivative assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=28370219&loc=SL20226016-175313 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (d)(2) -URI http://asc.fasb.org/extlink&oid=20225523&loc=SL20225862-175312 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 8 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=7476318&loc=d3e41678-113959 + Details
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