Operating Segment Data Segment Narrative (Details) - USD ($) $ in Thousands	3 Months Ended			6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016		Jun. 30, 2017	Jun. 30, 2016
Segment Reporting Information [Line Items]
Income (Loss) from Continuing Operations	$ (7,199)	$ 11,046		$ (4,691)	$ 16,021
Net income (loss) attributable to consolidated CLOs	2,895	4,912		6,810	6,017
Corporate And Eliminations
Segment Reporting Information [Line Items]
Income (Loss) from Continuing Operations	(8,268)	(8,369)	[1]	(15,080)	(13,459)	[1]
Net income (loss) attributable to consolidated CLOs	0	0	[1]	0	0
Specialty Insurance
Segment Reporting Information [Line Items]
Income (Loss) from Continuing Operations	(732)	12,765		4,069	24,968	[1]
Net income (loss) attributable to consolidated CLOs	0	0		0	0
Asset Management Segment
Segment Reporting Information [Line Items]
Income (Loss) from Continuing Operations	4,529	5,493		10,110	8,197	[1]
Net income (loss) attributable to consolidated CLOs	$ 2,895	4,912		$ 6,810	6,017	[1]
Scenario, Previously Reported | Reclassifications | Corporate And Eliminations
Segment Reporting Information [Line Items]
Income (Loss) from Continuing Operations		9,102			13,352
Scenario, Adjustment | Reclassifications | Specialty Insurance
Segment Reporting Information [Line Items]
Income (Loss) from Continuing Operations		4,687			7,893
Scenario, Adjustment | Reclassifications | Asset Management Segment
Segment Reporting Information [Line Items]
Income (Loss) from Continuing Operations		4,415			5,459
Net income (loss) attributable to consolidated CLOs		$ 4,166			$ 4,271

[1] (1) Reclassified to conform to current period presentation