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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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- Definition Accumulated appreciation or loss, net of tax, in value of the total of available-for-sale securities at the end of an accounting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=28358780&loc=SL7669686-108580 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=28358780&loc=d3e637-108580 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14 -URI http://asc.fasb.org/extlink&oid=28358780&loc=d3e681-108580 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 10A -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=28358780&loc=SL7669646-108580 + Details
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