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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
	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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- Definition

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

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