Organization And Nature Of Operations (Narrative) (Details) $ / shares in Units, $ in Millions	3 Months Ended
Mar. 31, 2020 USD ($) segment $ / shares	Dec. 31, 2019 $ / shares
Securities [Line Items]
Common Stock, Par or Stated Value Per Share \| $ / shares	$ 0.01	$ 0.01
Assets under management	$ 2,650
Number of Operating Segments \| segment	3
CDOs [Member]
Securities [Line Items]
Assets under management	$ 2,100
Assets under management which are collateralized debt obligations percentage	79.00%

Number of operating segments. An operating segment is a component of an enterprise: (a) that engages in business activities from which it may earn revenues and incur expenses (including revenues and expenses relating to transactions with other components of the same enterprise), (b) whose operating results are regularly reviewed by the enterprise's chief operating decision maker to make decisions about resources to be allocated to the segment and assess its performance, and (c) for which discrete financial information is available. An operating segment may engage in business activities for which it has yet to earn revenues, for example, start-up operations may be operating segments before earning revenues.

No definition available.

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration