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Note 4 - Fair Value of Financial Instruments Fair Value Assets Liabilities by Hierarchy Level (Details) (USD $) | Jun. 30, 2014 | Dec. 31, 2013 | Jun. 30, 2013
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Fair Value by Hierarchy Level [Line Items] |  |  |  |  |
Held-to-maturity Securities | $ 50,000 |  | $ 358,000 |  |
Derivative Assets | 22,033,000 |  | 16,642,000 |  |
Derivative liabilities | 200,227,000 |  | 307,185,000 |  | 350,576,000
VIE debt—at fair value | 93,631,000 |  | 94,645,000 |  | 106,767,000
Carrying (Reported) Amount, Fair Value Disclosure [Member] |  |  |  |  |
Fair Value by Hierarchy Level [Line Items] |  |  |  |  |
Held-to-maturity Securities | 100,000 |  | 400,000 |  |
Other Invested Assets, Carrying Amount | 40,600,000 |  | 47,400,000 |  |
Fair Value, Measurements, Recurring |  |  |  |  |
Fair Value by Hierarchy Level [Line Items] |  |  |  |  |
Total Investments at Fair Value | 4,907,100,000 | [1] | 4,883,400,000 | [2] |
Derivative Assets | 22,000,000 |  | 16,600,000 |  |
Other Assets | 90,400,000 | [3] | 91,900,000 | [3] |
Total Assets at Fair Value | 5,019,500,000 |  | 4,991,900,000 |  |
Derivative liabilities | 200,200,000 |  | 307,200,000 |  |
VIE debt—at fair value | 93,600,000 | [4] | 94,600,000 | [5] |
Total Liabilities at Fair Value | 293,800,000 |  | 401,800,000 |  |
US government and agency securities | Fair Value, Measurements, Recurring |  |  |  |  |
Fair Value by Hierarchy Level [Line Items] |  |  |  |  |
Total Investments at Fair Value | 1,353,500,000 |  | 1,157,900,000 |  |
State and municipal obligations | Fair Value, Measurements, Recurring |  |  |  |  |
Fair Value by Hierarchy Level [Line Items] |  |  |  |  |
Total Investments at Fair Value | 635,400,000 |  | 621,000,000 |  |
Money market instruments | Fair Value, Measurements, Recurring |  |  |  |  |
Fair Value by Hierarchy Level [Line Items] |  |  |  |  |
Total Investments at Fair Value | 661,800,000 |  | 672,600,000 |  |
Corporate bonds and notes | Fair Value, Measurements, Recurring |  |  |  |  |
Fair Value by Hierarchy Level [Line Items] |  |  |  |  |
Total Investments at Fair Value | 1,063,200,000 |  | 1,036,600,000 |  |
RMBS | Fair Value, Measurements, Recurring |  |  |  |  |
Fair Value by Hierarchy Level [Line Items] |  |  |  |  |
Total Investments at Fair Value | 296,400,000 |  | 560,400,000 |  |
CMBS | Fair Value, Measurements, Recurring |  |  |  |  |
Fair Value by Hierarchy Level [Line Items] |  |  |  |  |
Total Investments at Fair Value | 278,600,000 |  | 288,900,000 |  |
Other ABS | Fair Value, Measurements, Recurring |  |  |  |  |
Fair Value by Hierarchy Level [Line Items] |  |  |  |  |
Total Investments at Fair Value | 251,600,000 |  | 195,800,000 |  |
Foreign government securities | Fair Value, Measurements, Recurring |  |  |  |  |
Fair Value by Hierarchy Level [Line Items] |  |  |  |  |
Total Investments at Fair Value | 49,200,000 |  | 40,700,000 |  |
Equity securities | Fair Value, Measurements, Recurring |  |  |  |  |
Fair Value by Hierarchy Level [Line Items] |  |  |  |  |
Total Investments at Fair Value | 232,500,000 | [6] | 225,800,000 | [7] |
Other investments | Fair Value, Measurements, Recurring |  |  |  |  |
Fair Value by Hierarchy Level [Line Items] |  |  |  |  |
Total Investments at Fair Value | 84,900,000 | [8] | 83,700,000 | [9] |
Fair Value, Inputs, Level 1 | Fair Value, Measurements, Recurring |  |  |  |  |
Fair Value by Hierarchy Level [Line Items] |  |  |  |  |
Total Investments at Fair Value | 1,763,400,000 | [1] | 1,555,900,000 | [2] |
Derivative Assets | 0 |  | 0 |  |
Other Assets | 0 | [3] | 0 | [3] |
Total Assets at Fair Value | 1,763,400,000 |  | 1,555,900,000 |  |
Derivative liabilities | 0 |  | 0 |  |
VIE debt—at fair value | 0 | [4] | 0 | [5] |
Total Liabilities at Fair Value | 0 |  | 0 |  |
Fair Value, Inputs, Level 1 | US government and agency securities | Fair Value, Measurements, Recurring |  |  |  |  |
Fair Value by Hierarchy Level [Line Items] |  |  |  |  |
Total Investments at Fair Value | 965,500,000 |  | 755,000,000 |  |
Fair Value, Inputs, Level 1 | State and municipal obligations | Fair Value, Measurements, Recurring |  |  |  |  |
Fair Value by Hierarchy Level [Line Items] |  |  |  |  |
Total Investments at Fair Value | 0 |  | 0 |  |
Fair Value, Inputs, Level 1 | Money market instruments | Fair Value, Measurements, Recurring |  |  |  |  |
Fair Value by Hierarchy Level [Line Items] |  |  |  |  |
Total Investments at Fair Value | 661,800,000 |  | 672,600,000 |  |
Fair Value, Inputs, Level 1 | Corporate bonds and notes | Fair Value, Measurements, Recurring |  |  |  |  |
Fair Value by Hierarchy Level [Line Items] |  |  |  |  |
Total Investments at Fair Value | 0 |  | 0 |  |
Fair Value, Inputs, Level 1 | RMBS | Fair Value, Measurements, Recurring |  |  |  |  |
Fair Value by Hierarchy Level [Line Items] |  |  |  |  |
Total Investments at Fair Value | 0 |  | 0 |  |
Fair Value, Inputs, Level 1 | CMBS | Fair Value, Measurements, Recurring |  |  |  |  |
Fair Value by Hierarchy Level [Line Items] |  |  |  |  |
Total Investments at Fair Value | 0 |  | 0 |  |
Fair Value, Inputs, Level 1 | Other ABS | Fair Value, Measurements, Recurring |  |  |  |  |
Fair Value by Hierarchy Level [Line Items] |  |  |  |  |
Total Investments at Fair Value | 0 |  | 0 |  |
Fair Value, Inputs, Level 1 | Foreign government securities | Fair Value, Measurements, Recurring |  |  |  |  |
Fair Value by Hierarchy Level [Line Items] |  |  |  |  |
Total Investments at Fair Value | 0 |  | 0 |  |
Fair Value, Inputs, Level 1 | Equity securities | Fair Value, Measurements, Recurring |  |  |  |  |
Fair Value by Hierarchy Level [Line Items] |  |  |  |  |
Total Investments at Fair Value | 136,100,000 | [6] | 128,300,000 | [7] |
Fair Value, Inputs, Level 1 | Other investments | Fair Value, Measurements, Recurring |  |  |  |  |
Fair Value by Hierarchy Level [Line Items] |  |  |  |  |
Total Investments at Fair Value | 0 | [8] | 0 | [9] |
Fair Value, Inputs, Level 2 | Fair Value, Measurements, Recurring |  |  |  |  |
Fair Value by Hierarchy Level [Line Items] |  |  |  |  |
Total Investments at Fair Value | 2,967,000,000 | [1] | 3,226,000,000 | [2] |
Derivative Assets | 15,600,000 |  | 10,300,000 |  |
Other Assets | 0 | [3] | 0 | [3] |
Total Assets at Fair Value | 2,982,600,000 |  | 3,236,300,000 |  |
Derivative liabilities | 0 |  | 0 |  |
VIE debt—at fair value | 0 | [4] | 0 | [5] |
Total Liabilities at Fair Value | 0 |  | 0 |  |
Fair Value, Inputs, Level 2 | US government and agency securities | Fair Value, Measurements, Recurring |  |  |  |  |
Fair Value by Hierarchy Level [Line Items] |  |  |  |  |
Total Investments at Fair Value | 388,000,000 |  | 402,900,000 |  |
Fair Value, Inputs, Level 2 | State and municipal obligations | Fair Value, Measurements, Recurring |  |  |  |  |
Fair Value by Hierarchy Level [Line Items] |  |  |  |  |
Total Investments at Fair Value | 615,900,000 |  | 602,300,000 |  |
Fair Value, Inputs, Level 2 | Money market instruments | Fair Value, Measurements, Recurring |  |  |  |  |
Fair Value by Hierarchy Level [Line Items] |  |  |  |  |
Total Investments at Fair Value | 0 |  | 0 |  |
Fair Value, Inputs, Level 2 | Corporate bonds and notes | Fair Value, Measurements, Recurring |  |  |  |  |
Fair Value by Hierarchy Level [Line Items] |  |  |  |  |
Total Investments at Fair Value | 1,063,200,000 |  | 1,036,600,000 |  |
Fair Value, Inputs, Level 2 | RMBS | Fair Value, Measurements, Recurring |  |  |  |  |
Fair Value by Hierarchy Level [Line Items] |  |  |  |  |
Total Investments at Fair Value | 296,400,000 |  | 560,400,000 |  |
Fair Value, Inputs, Level 2 | CMBS | Fair Value, Measurements, Recurring |  |  |  |  |
Fair Value by Hierarchy Level [Line Items] |  |  |  |  |
Total Investments at Fair Value | 278,600,000 |  | 288,900,000 |  |
Fair Value, Inputs, Level 2 | Other ABS | Fair Value, Measurements, Recurring |  |  |  |  |
Fair Value by Hierarchy Level [Line Items] |  |  |  |  |
Total Investments at Fair Value | 177,200,000 |  | 194,900,000 |  |
Fair Value, Inputs, Level 2 | Foreign government securities | Fair Value, Measurements, Recurring |  |  |  |  |
Fair Value by Hierarchy Level [Line Items] |  |  |  |  |
Total Investments at Fair Value | 49,200,000 |  | 40,700,000 |  |
Fair Value, Inputs, Level 2 | Equity securities | Fair Value, Measurements, Recurring |  |  |  |  |
Fair Value by Hierarchy Level [Line Items] |  |  |  |  |
Total Investments at Fair Value | 96,400,000 | [6] | 97,100,000 | [7] |
Fair Value, Inputs, Level 2 | Other investments | Fair Value, Measurements, Recurring |  |  |  |  |
Fair Value by Hierarchy Level [Line Items] |  |  |  |  |
Total Investments at Fair Value | 2,100,000 | [8] | 2,200,000 | [9] |
Fair Value, Inputs, Level 2 | Trust Preferred Securities [Member] | Fair Value, Measurements, Recurring |  |  |  |  |
Fair Value by Hierarchy Level [Line Items] |  |  |  |  |
Total Investments at Fair Value | 500,000 |  | 600,000 |  |
Fair Value, Inputs, Level 2 | Short Term CDs | Fair Value, Measurements, Recurring |  |  |  |  |
Fair Value by Hierarchy Level [Line Items] |  |  |  |  |
Total Investments at Fair Value | 1,600,000 |  | 1,600,000 |  |
Fair Value, Inputs, Level 3 |  |  |  |  |
Fair Value by Hierarchy Level [Line Items] |  |  |  |  |
Number Of Consolidated Other Financial Guaranty Transactions | 2 |  | 2 |  |
Fair Value, Inputs, Level 3 | Fair Value, Measurements, Recurring |  |  |  |  |
Fair Value by Hierarchy Level [Line Items] |  |  |  |  |
Total Investments at Fair Value | 176,700,000 | [1] | 101,500,000 | [2] |
Derivative Assets | 6,400,000 |  | 6,300,000 |  |
Other Assets | 90,400,000 | [3] | 91,900,000 | [3] |
Total Assets at Fair Value | 273,500,000 |  | 199,700,000 |  |
Derivative liabilities | 200,200,000 |  | 307,200,000 |  |
VIE debt—at fair value | 93,600,000 | [4] | 94,600,000 | [5] |
Total Liabilities at Fair Value | 293,800,000 |  | 401,800,000 |  |
Total Level III Assets | 5.40% |  | 4.00% |  |
Total Level III Liabilities | 100.00% |  | 100.00% |  |
Fair Value, Inputs, Level 3 | Fair Value, Measurements, Recurring | NIMS VIEs [Member] |  |  |  |  |
Fair Value by Hierarchy Level [Line Items] |  |  |  |  |
VIE debt—at fair value | 3,200,000 |  | 2,800,000 |  |
Fair Value, Inputs, Level 3 | Fair Value, Measurements, Recurring | Consolidated Financial Guaranty Insurance Contracts [Member] |  |  |  |  |
Fair Value by Hierarchy Level [Line Items] |  |  |  |  |
VIE debt—at fair value | 90,400,000 |  | 91,800,000 |  |
Fair Value, Inputs, Level 3 | US government and agency securities | Fair Value, Measurements, Recurring |  |  |  |  |
Fair Value by Hierarchy Level [Line Items] |  |  |  |  |
Total Investments at Fair Value | 0 |  | 0 |  |
Fair Value, Inputs, Level 3 | State and municipal obligations | Fair Value, Measurements, Recurring |  |  |  |  |
Fair Value by Hierarchy Level [Line Items] |  |  |  |  |
Total Investments at Fair Value | 19,500,000 |  | 18,700,000 |  |
Fair Value, Inputs, Level 3 | Money market instruments | Fair Value, Measurements, Recurring |  |  |  |  |
Fair Value by Hierarchy Level [Line Items] |  |  |  |  |
Total Investments at Fair Value | 0 |  | 0 |  |
Fair Value, Inputs, Level 3 | Corporate bonds and notes | Fair Value, Measurements, Recurring |  |  |  |  |
Fair Value by Hierarchy Level [Line Items] |  |  |  |  |
Total Investments at Fair Value | 0 |  | 0 |  |
Fair Value, Inputs, Level 3 | RMBS | Fair Value, Measurements, Recurring |  |  |  |  |
Fair Value by Hierarchy Level [Line Items] |  |  |  |  |
Total Investments at Fair Value | 0 |  | 0 |  |
Fair Value, Inputs, Level 3 | CMBS | Fair Value, Measurements, Recurring |  |  |  |  |
Fair Value by Hierarchy Level [Line Items] |  |  |  |  |
Total Investments at Fair Value | 0 |  | 0 |  |
Fair Value, Inputs, Level 3 | Other ABS | Fair Value, Measurements, Recurring |  |  |  |  |
Fair Value by Hierarchy Level [Line Items] |  |  |  |  |
Total Investments at Fair Value | 74,400,000 |  | 900,000 |  |
Fair Value, Inputs, Level 3 | Foreign government securities | Fair Value, Measurements, Recurring |  |  |  |  |
Fair Value by Hierarchy Level [Line Items] |  |  |  |  |
Total Investments at Fair Value | 0 |  | 0 |  |
Fair Value, Inputs, Level 3 | Equity securities | Fair Value, Measurements, Recurring |  |  |  |  |
Fair Value by Hierarchy Level [Line Items] |  |  |  |  |
Total Investments at Fair Value | 0 | [6] | 400,000 | [7] |
Fair Value, Inputs, Level 3 | Other investments | Fair Value, Measurements, Recurring |  |  |  |  |
Fair Value by Hierarchy Level [Line Items] |  |  |  |  |
Total Investments at Fair Value | 82,800,000 | [8] | 81,500,000 | [9] |
Fair Value, Inputs, Level 3 | Trust Preferred Securities [Member] | Fair Value, Measurements, Recurring |  |  |  |  |
Fair Value by Hierarchy Level [Line Items] |  |  |  |  |
Total Investments at Fair Value | 200,000 |  | 200,000 |  |
Fair Value, Inputs, Level 3 | Lottery Annuities | Fair Value, Measurements, Recurring |  |  |  |  |
Fair Value by Hierarchy Level [Line Items] |  |  |  |  |
Total Investments at Fair Value | 300,000 |  | 300,000 |  |
Fair Value, Inputs, Level 3 | Guaranteed Investment Contract Held by a Consolidated VIE [Member] | Fair Value, Measurements, Recurring |  |  |  |  |
Fair Value by Hierarchy Level [Line Items] |  |  |  |  |
Total Investments at Fair Value | $ 82,300,000 |  | $ 81,000,000 |  |
[1] | Does not include fixed-maturities held to maturity ($0.1 million) and certain other invested assets ($40.6 million), primarily invested in limited partnerships, accounted for as cost-method investments and not measured at fair value.
[2] | Does not include fixed-maturities held to maturity ($0.4 million) and certain other invested assets ($47.4 million), primarily invested in limited partnerships, accounted for as cost-method investments and not measured at fair value.
[3] | Primarily comprising manufactured housing loan collateral related to two consolidated financial guaranty VIEs.
[4] | Comprising consolidated debt related to NIMS VIEs ($3.2 million) and financial guaranty VIEs ($90.4 million).
[5] | Comprising consolidated debt related to NIMS VIEs ($2.8 million) and financial guaranty VIEs ($91.8 million).
[6] | Comprising broadly diversified domestic equity mutual funds included within Level I and various preferred and common stocks invested across numerous companies and industries included within Level II.
[7] | Comprising broadly diversified domestic equity mutual funds included within Level I and various preferred and common stocks invested across numerous companies and industries included within Levels II and III.
[8] | Comprising TruPs ($0.5 million) and short-term certificates of deposit (“CDs”) ($1.6 million) included within Level II and lottery annuities ($0.3 million), TruPs ($0.2 million), and a guaranteed investment contract held by a consolidated VIE ($82.3 million) within Level III.
[9] | Comprising TruPs ($0.6 million) and short-term CDs ($1.6 million ) included within Level II and lottery annuities ($0.3 million), TruPs ($0.2 million), and a guaranteed investment contract held by a consolidated VIE ($81.0 million) within Level III.

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- Definition This concept represents the total level III assets as a percentage of total assets measured at fair value. + References No definition available. + Details
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- Definition Total Level III Liabilities is the percentage of total level III liabilities to the total liabilities measured at fair value + References No definition available. + Details
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- Definition This concept represents the amount of debt related to Variable Interest Entities that have been consolidated as the entity is the primary beneficiary of that VIE or has the ability to control its actions. + References No definition available. + Details
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- Definition Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19207-110258 + 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 825 -SubTopic 10 -Section 50 -Paragraph 10 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=35750535&loc=d3e13433-108611 Reference 2: 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 3: 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=35750535&loc=d3e13495-108611 Reference 4: 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=34720828&loc=SL20225862-175312 Reference 5: 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 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=36459792&loc=SL20226008-175313 + Details
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- Definition Fair value, after the effects of master netting arrangements, of a financial liability or 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 liabilities 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 825 -SubTopic 10 -Section 50 -Paragraph 10 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=35750535&loc=d3e13433-108611 Reference 2: 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 3: 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=35750535&loc=d3e13495-108611 Reference 4: 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=34720828&loc=SL20225862-175312 Reference 5: 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 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=36459792&loc=SL20226008-175313 + Details
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- Definition Fair value of financial and nonfinancial obligations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19207-110258 + Details
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- Definition Fair value portion of other assets. + References No definition available. + Details
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