Marketable Securities (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014	Dec. 31, 2014
Schedule of Available-for-sale Securities [Line Items]
Marketable Securities, Realized Gain (Loss)	$ 31	$ 34	$ 61	$ 66
Available-for-sale Debt Securities, Amortized Cost Basis	27,570		27,570		$ 24,509
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax	3		3		7
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax	(1)		(1)		(3)
Available-for-sale Securities	27,572		27,572		24,513
Municipal Bonds [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Debt Securities, Amortized Cost Basis	775		775		1,358
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax	0		0		1
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax	0		0		0
Available-for-sale Securities	775		775		1,359
Corporate Debt Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Debt Securities, Amortized Cost Basis	3,608		3,608		4,665
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax	1		1		2
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax	0		0		0
Available-for-sale Securities	3,609		3,609		4,667
Government Agency Debt Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Debt Securities, Amortized Cost Basis	1,502		1,502		3,505
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax	0		0		0
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax	(1)		(1)		(3)
Available-for-sale Securities	1,501		1,501		3,502
Mutual Funds, Money Market [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Debt Securities, Amortized Cost Basis	12,564		12,564		6,824
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax	0		0		0
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax	0		0		0
Available-for-sale Securities	12,564		12,564		6,824
Debt Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Debt Maturities, Next Twelve Months, Amortized Cost Basis	7,414		7,414		7,663
Available-for-sale Securities, Debt Maturities, Next Twelve Months, Fair Value	7,417		7,417		7,668
Available-for-sale Securities, Debt Maturities, Year Two, Amortized Cost Basis	7,592		7,592		10,022
Available-for-sale Securities, Debt Maturities, Year Two, Fair Value	7,591		7,591		10,021
Available-for-sale Debt Securities, Amortized Cost Basis	15,006		15,006		17,685
Available-for-sale Securities	$ 15,008		$ 15,008		$ 17,689

Available-for-sale Securities, Debt Maturities, Year Two, Amortized Cost Basis

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Available-for-sale Securities, Debt Maturities, Year Two, Fair Value

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This item represents the cost of debt securities, which are categorized neither as held-to-maturity nor trading, net of adjustments including accretion, amortization, collection of cash, previous other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments recognized, as defined), and fair value hedge accounting adjustments, if any.

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Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading.

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Amount before tax of unrealized loss in accumulated other comprehensive income (AOCI) on investments in debt and equity securities classified as available-for-sale.

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Amount after adjustments of available-for-sale debt securities at cost, maturing in the next fiscal year following the latest fiscal year. Adjustments include, but are not limited to, accretion, amortization, collection of cash, previous other-than-temporary impairments (OTTI) recognized in earnings less cumulative-effect adjustments, and fair value hedge accounting adjustments. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Fair value of available-for-sale debt securities maturing in the next fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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