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Derivative Instruments (Derivative Instruments Offsetting Balance Sheet) (Details) (USD $) In Thousands, unless otherwise specified | Sep. 30, 2013 | Dec. 31, 2012
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Derivative Assets [Abstract] |  |  |  |
Gross Amounts Recognized | $ 109,819 |  | $ 190,634 |
Gross Amounts Offset in the Balance Sheet | (22,398) |  | (22,426) |
Net Amounts Presented in the Balance Sheet | 87,421 |  | 168,208 |
Derivative Asset, Fair Value of Collateral | (10,624) | [1] | (22,458) | [1]
Gross Amounts Not Offset in the Balance Sheet - Cash Collateral Pledged/Received | (64,027) | [2] | (136,414) | [2]
Net Amount | 12,770 |  | 9,336 |
Derivative Liabilities [Abstract] |  |  |  |
Gross Amounts Recognized | 35,546 |  | 54,078 |
Gross Amounts Offset in the Balance Sheet | (22,398) |  | (22,426) |
Net Amounts Presented in the Balance Sheet | 13,148 |  | 31,652 |
Gross Amounts Not Offset in the Balance Sheet - Financial Instruments | (15,238) | [3] | (1,565) | [3]
Gross Amounts Not Offset in the Balance Sheet - Cash Collateral Pledged/Received | (8,150) | [4] | (27,867) | [4]
Net Amount | $ (10,240) |  | $ 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 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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