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Financial Guarantee Insurance Contracts Earned Premiums by Geographic Location (Details) - USD ($) $ in Thousands	3 Months Ended
	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

X

- Definition

Amount, after premiums ceded to other entities and premiums assumed by the entity, of financial guarantee premiums earned.

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