Other Assets (Schedule of Other Assets) (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Other Assets [Abstract]
Profit sharing commission receivable	$ 252	$ 251
Credit Facility B issuance costs	122	109
Accrued investment income	4,859	4,599
Investment in unconsolidated trust subsidiaries	1,702	1,702
Fixed assets	6,726	6,947
Other assets	195	193
Other Assets, Total	$ 13,856	$ 13,801