Fair Value Measurements (Fair Value Of Certain Financial Assets And Liabilities) (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fixed income securities owned	$ 21,153	$ 21,133
Trading securities	4,914	4,849
Estimate of Fair Value Measurement [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Equity available-for-sale securities	11,713	11,633
Fixed income available-for-sale securities	69,947	71,690
Fixed income securities owned	21,153	21,133
Trading securities	4,914	4,849
Assets, fair value	107,727	109,305
Quoted Prices In Active Markets For Identical Assets (Level 1) [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Equity available-for-sale securities	11,713	11,633
Fixed income available-for-sale securities	0	0
Fixed income securities owned	0	0
Trading securities	4,914	4,849
Assets, fair value	16,627	16,482
Significant Other Observable Inputs (Level 2) [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Equity available-for-sale securities	0	0
Fixed income available-for-sale securities	69,947	71,690
Fixed income securities owned	21,153	21,133
Trading securities	0	0
Assets, fair value	$ 91,100	$ 92,823