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Investments (Securities Pledged as Collateral Related to Repurchase Reverse Repurchase Program) (Details) - USD ($) $ in Thousands | Jun. 30, 2016 | Dec. 31, 2015
--- | --- | ---
Assets Sold under Agreements to Repurchase [Line Items] |  |
FinancialAssetsSoldUnderAgreementsToRepurchaseGrossIncludingNotSubjectToMasterNettingArrangement | $ 480,618 | $ 465,889
Securities Sold under Agreements to Repurchase, Gross Including Not Subject to Master Netting Arrangement | 485,826 | 481,197
SecuredBorrowingsGrossDifferenceAmount | 5,208 | 15,308
Corporate Debt Securities [Member] |  |
Assets Sold under Agreements to Repurchase [Line Items] |  |
FinancialAssetsSoldUnderAgreementsToRepurchaseGrossIncludingNotSubjectToMasterNettingArrangement | 146,865 | 150,275
Residential Mortgage Backed Securities [Member] |  |
Assets Sold under Agreements to Repurchase [Line Items] |  |
FinancialAssetsSoldUnderAgreementsToRepurchaseGrossIncludingNotSubjectToMasterNettingArrangement | 101,715 | 97,639
US Treasury and Government [Member] |  |
Assets Sold under Agreements to Repurchase [Line Items] |  |
FinancialAssetsSoldUnderAgreementsToRepurchaseGrossIncludingNotSubjectToMasterNettingArrangement | 212,918 | 199,431
Foreign Government Debt Securities [Member] |  |
Assets Sold under Agreements to Repurchase [Line Items] |  |
FinancialAssetsSoldUnderAgreementsToRepurchaseGrossIncludingNotSubjectToMasterNettingArrangement | 14,524 | 3,358
Other Debt Obligations [Member] |  |
Assets Sold under Agreements to Repurchase [Line Items] |  |
FinancialAssetsSoldUnderAgreementsToRepurchaseGrossIncludingNotSubjectToMasterNettingArrangement | 4,596 | 15,186
Maturity Overnight [Member] |  |
Assets Sold under Agreements to Repurchase [Line Items] |  |
FinancialAssetsSoldUnderAgreementsToRepurchaseGrossIncludingNotSubjectToMasterNettingArrangement | 4,596 | 15,186
Maturity Overnight [Member] | Corporate Debt Securities [Member] |  |
Assets Sold under Agreements to Repurchase [Line Items] |  |
FinancialAssetsSoldUnderAgreementsToRepurchaseGrossIncludingNotSubjectToMasterNettingArrangement | 0 | 0
Maturity Overnight [Member] | Residential Mortgage Backed Securities [Member] |  |
Assets Sold under Agreements to Repurchase [Line Items] |  |
FinancialAssetsSoldUnderAgreementsToRepurchaseGrossIncludingNotSubjectToMasterNettingArrangement | 0 | 0
Maturity Overnight [Member] | US Treasury and Government [Member] |  |
Assets Sold under Agreements to Repurchase [Line Items] |  |
FinancialAssetsSoldUnderAgreementsToRepurchaseGrossIncludingNotSubjectToMasterNettingArrangement | 0 | 0
Maturity Overnight [Member] | Foreign Government Debt Securities [Member] |  |
Assets Sold under Agreements to Repurchase [Line Items] |  |
FinancialAssetsSoldUnderAgreementsToRepurchaseGrossIncludingNotSubjectToMasterNettingArrangement | 0 | 0
Maturity Overnight [Member] | Other Debt Obligations [Member] |  |
Assets Sold under Agreements to Repurchase [Line Items] |  |
FinancialAssetsSoldUnderAgreementsToRepurchaseGrossIncludingNotSubjectToMasterNettingArrangement | 4,596 | 15,186
Maturity up to 30 days [Member] |  |
Assets Sold under Agreements to Repurchase [Line Items] |  |
FinancialAssetsSoldUnderAgreementsToRepurchaseGrossIncludingNotSubjectToMasterNettingArrangement | 5,329 | 2,951
Maturity up to 30 days [Member] | Corporate Debt Securities [Member] |  |
Assets Sold under Agreements to Repurchase [Line Items] |  |
FinancialAssetsSoldUnderAgreementsToRepurchaseGrossIncludingNotSubjectToMasterNettingArrangement | 5,329 | 2,951
Maturity up to 30 days [Member] | Residential Mortgage Backed Securities [Member] |  |
Assets Sold under Agreements to Repurchase [Line Items] |  |
FinancialAssetsSoldUnderAgreementsToRepurchaseGrossIncludingNotSubjectToMasterNettingArrangement | 0 | 0
Maturity up to 30 days [Member] | US Treasury and Government [Member] |  |
Assets Sold under Agreements to Repurchase [Line Items] |  |
FinancialAssetsSoldUnderAgreementsToRepurchaseGrossIncludingNotSubjectToMasterNettingArrangement | 0 | 0
Maturity up to 30 days [Member] | Foreign Government Debt Securities [Member] |  |
Assets Sold under Agreements to Repurchase [Line Items] |  |
FinancialAssetsSoldUnderAgreementsToRepurchaseGrossIncludingNotSubjectToMasterNettingArrangement | 0 | 0
Maturity up to 30 days [Member] | Other Debt Obligations [Member] |  |
Assets Sold under Agreements to Repurchase [Line Items] |  |
FinancialAssetsSoldUnderAgreementsToRepurchaseGrossIncludingNotSubjectToMasterNettingArrangement | 0 | 0
Maturity 30 to 90 Days [Member] |  |
Assets Sold under Agreements to Repurchase [Line Items] |  |
FinancialAssetsSoldUnderAgreementsToRepurchaseGrossIncludingNotSubjectToMasterNettingArrangement | 4,031 | 0
Maturity 30 to 90 Days [Member] | Corporate Debt Securities [Member] |  |
Assets Sold under Agreements to Repurchase [Line Items] |  |
FinancialAssetsSoldUnderAgreementsToRepurchaseGrossIncludingNotSubjectToMasterNettingArrangement | 4,031 | 0
Maturity 30 to 90 Days [Member] | Residential Mortgage Backed Securities [Member] |  |
Assets Sold under Agreements to Repurchase [Line Items] |  |
FinancialAssetsSoldUnderAgreementsToRepurchaseGrossIncludingNotSubjectToMasterNettingArrangement | 0 | 0
Maturity 30 to 90 Days [Member] | US Treasury and Government [Member] |  |
Assets Sold under Agreements to Repurchase [Line Items] |  |
FinancialAssetsSoldUnderAgreementsToRepurchaseGrossIncludingNotSubjectToMasterNettingArrangement | 0 | 0
Maturity 30 to 90 Days [Member] | Foreign Government Debt Securities [Member] |  |
Assets Sold under Agreements to Repurchase [Line Items] |  |
FinancialAssetsSoldUnderAgreementsToRepurchaseGrossIncludingNotSubjectToMasterNettingArrangement | 0 | 0
Maturity 30 to 90 Days [Member] | Other Debt Obligations [Member] |  |
Assets Sold under Agreements to Repurchase [Line Items] |  |
FinancialAssetsSoldUnderAgreementsToRepurchaseGrossIncludingNotSubjectToMasterNettingArrangement | 0 | 0
Maturity over 90 days [Member] |  |
Assets Sold under Agreements to Repurchase [Line Items] |  |
FinancialAssetsSoldUnderAgreementsToRepurchaseGrossIncludingNotSubjectToMasterNettingArrangement | 466,662 | 447,752
Maturity over 90 days [Member] | Corporate Debt Securities [Member] |  |
Assets Sold under Agreements to Repurchase [Line Items] |  |
FinancialAssetsSoldUnderAgreementsToRepurchaseGrossIncludingNotSubjectToMasterNettingArrangement | 137,505 | 147,324
Maturity over 90 days [Member] | Residential Mortgage Backed Securities [Member] |  |
Assets Sold under Agreements to Repurchase [Line Items] |  |
FinancialAssetsSoldUnderAgreementsToRepurchaseGrossIncludingNotSubjectToMasterNettingArrangement | 101,715 | 97,639
Maturity over 90 days [Member] | US Treasury and Government [Member] |  |
Assets Sold under Agreements to Repurchase [Line Items] |  |
FinancialAssetsSoldUnderAgreementsToRepurchaseGrossIncludingNotSubjectToMasterNettingArrangement | 212,918 | 199,431
Maturity over 90 days [Member] | Foreign Government Debt Securities [Member] |  |
Assets Sold under Agreements to Repurchase [Line Items] |  |
FinancialAssetsSoldUnderAgreementsToRepurchaseGrossIncludingNotSubjectToMasterNettingArrangement | 14,524 | 3,358
Maturity over 90 days [Member] | Other Debt Obligations [Member] |  |
Assets Sold under Agreements to Repurchase [Line Items] |  |
FinancialAssetsSoldUnderAgreementsToRepurchaseGrossIncludingNotSubjectToMasterNettingArrangement | $ 0 | $ 0

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- Definition Amount, before effects of master netting arrangements, of funds outstanding borrowed in the form of a financial asset repurchase agreement between the entity and another party for the sale and repurchase of identical or substantially the same financial asset at a date certain for a specified price. Includes repurchase-to-maturity transactions and liabilities not subject to a master netting arrangement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 30 -Section 50 -Paragraph 7 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=64858031&loc=SL34722452-111729 + Details
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