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Marketable Securities (Narrative) (Details) (USD $) In Thousands, unless otherwise specified	6 Months Ended			3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Dec. 31, 2013	Jun. 30, 2014 Trading Securities [Member]	Jun. 30, 2013 Trading Securities [Member]	Jun. 30, 2014 Trading Securities [Member]	Dec. 31, 2013 Trading Securities [Member]
Schedule of Investments [Line Items]
Net unrealized gains	$ 2,308		$ 1,386
Unrealized gains during the period, income tax expense	1,148		430
Available-for-sale securities, gross realized gains	230	703
Available-for-sale securities, gross realized losses	123	175
Trading securities	5,270		4,849	5,270		5,270	4,849
Trading securities, realized gains				356		421
Trading securities, realized losses					460	475
Securities owned	$ 21,158		$ 21,133

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