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Financial Guarantee Insurance Contracts Earned Premiums by Geographic Location (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018
Premiums Earned, Net, Financial Guarantee Insurance Contracts | $ 7,833 | $ 25,836 | $ 35,591 | $ 56,719
United States [Member] | Reportable Geographical Components [Member] |  |  |  |
Premiums Earned, Net, Financial Guarantee Insurance Contracts | 5,626 | 19,752 | 33,869 | 44,469
United Kingdom [Member] | Reportable Geographical Components [Member] |  |  |  |
Premiums Earned, Net, Financial Guarantee Insurance Contracts | 4,224 | 4,958 | 8,415 | 9,815
Other International [Member] | Reportable Geographical Components [Member] |  |  |  |
Premiums Earned, Net, Financial Guarantee Insurance Contracts | $ (2,017) | $ 1,126 | $ (6,693) | $ 2,435

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