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Financial Guarantee Insurance Contracts Financial Guarantee Insurance Contracts Earned Premiums by Geographic Location (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
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Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Premiums Earned, Net, Financial Guarantee Insurance Contracts | $ 28,730 | $ 25,640 | $ 25,836 | $ 30,883 | $ 31,523 | $ 52,989 | $ 43,152 | $ 47,613 | $ 111,089 | $ 175,277 | $ 197,287
Reportable Geographical Components [Member] | UNITED STATES |  |  |  |  |  |  |  |  |  |  |
Premiums Earned, Net, Financial Guarantee Insurance Contracts |  |  |  |  |  |  |  |  | 87,539 | 134,099 | 168,646
Reportable Geographical Components [Member] | UNITED KINGDOM |  |  |  |  |  |  |  |  |  |  |
Premiums Earned, Net, Financial Guarantee Insurance Contracts |  |  |  |  |  |  |  |  | 18,580 | 32,928 | 24,470
Reportable Geographical Components [Member] | Other International [Member] |  |  |  |  |  |  |  |  |  |  |
Premiums Earned, Net, Financial Guarantee Insurance Contracts |  |  |  |  |  |  |  |  | $ 4,970 | $ 8,250 | $ 4,171

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