Investments (Summary of Realized Gain (Loss) on Investments) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended	6 Months Ended
Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Schedule of Investments [Line Items]
Gain on investments	$ 1,597	$ 1,219	$ 2,773	$ 1,118
Other-than-temporary impairments		(228)		(246)
Net realized gains	1,597	991	2,773	872
Corporate Bonds [Member]
Schedule of Investments [Line Items]
Gain on investments	467	(36)	825	(150)
Collateralized Corporate Bank Loans [Member]
Schedule of Investments [Line Items]
Gain on investments	98	135	271	136
Municipal Bonds [Member]
Schedule of Investments [Line Items]
Gain on investments	48	(163)	40	(243)
Financial Services [Member]
Schedule of Investments [Line Items]
Gain on investments	456	(22)	644	70
All Other [Member]
Schedule of Investments [Line Items]
Gain on investments	$ 528	$ 1,305	$ 993	$ 1,305

This item represents the net total realized and unrealized gain (loss) included in earnings for the period as a result of selling or holding marketable securities categorized as trading, available-for-sale, or held-to-maturity, including the unrealized holding gain (loss) of held-to-maturity securities transferred to the trading security category and the cumulative unrealized gain (loss) which was included in other comprehensive income (a separate component of shareholders' equity) for available-for-sale securities transferred to trading securities during the period. Additionally, this item would include any gains (losses) realized during the period from the sale of investments accounted for under the cost method of accounting.

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The amount by which the fair value of an investment is less than the amortized cost basis or carrying amount of that investment at the balance sheet date and the decline in fair value is deemed to be other than temporary, before considering whether or not such amount is recognized in earnings or other comprehensive income.

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Reference 5: http://www.xbrl.org/2003/role/presentationRef

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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 7: http://www.xbrl.org/2003/role/presentationRef

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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

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