Marketable Securities (Details) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2014	Dec. 31, 2013
Schedule of Available-for-sale Securities [Line Items]
Total available-for-sale securities, Amortized cost	$ 25,720	$ 25,490
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax	259	90
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax	(3)	(54)
Available-for-sale Securities, Fair Value Disclosure	25,976	25,526
Corporate Debt Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Total available-for-sale securities, Amortized cost	19,458	18,832
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax	214	68
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax	(2)	(43)
Available-for-sale Securities, Fair Value Disclosure	19,670	18,857
Municipal Bonds [Member]
Schedule of Available-for-sale Securities [Line Items]
Total available-for-sale securities, Amortized cost	6,262	6,658
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax	45	22
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax	(1)	(11)
Available-for-sale Securities, Fair Value Disclosure	$ 6,306	$ 6,669