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Financial Guarantee Insurance Contracts Earned Premiums by Geographic Location (Details) - USD ($) $ in Thousands | 3 Months Ended
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Mar. 31, 2019 | Mar. 31, 2018
Premiums Earned, Net, Financial Guarantee Insurance Contracts | $ 27,758 | $ 30,883
United States [Member] | Reportable Geographical Components [Member] |  |
Premiums Earned, Net, Financial Guarantee Insurance Contracts | 28,244 | 24,718
United Kingdom [Member] | Reportable Geographical Components [Member] |  |
Premiums Earned, Net, Financial Guarantee Insurance Contracts | 4,190 | 4,856
Other International [Member] | Reportable Geographical Components [Member] |  |
Premiums Earned, Net, Financial Guarantee Insurance Contracts | $ (4,676) | $ 1,309

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