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Marketable Securities (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended	12 Months Ended
	Mar. 31, 2014	Dec. 31, 2013
Schedule of Available-for-sale Securities [Line Items]
Amortized cost	$ 26,225	$ 25,490
Gross unrealized holding gains	178	90
Gross unrealized holding losses	(24)	(54)
Estimated fair value	26,379	25,526
Corporate Debt Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized cost	19,605	18,832
Gross unrealized holding gains	149	68
Gross unrealized holding losses	(17)	(43)
Estimated fair value	19,737	18,857
Municipal Bonds [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized cost	6,620	6,658
Gross unrealized holding gains	29	22
Gross unrealized holding losses	(7)	(11)
Estimated fair value	$ 6,642	$ 6,669

X

- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 320

-SubTopic 10

-Section 25

-Paragraph 1

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+ References

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Amount of unrealized gain before deducting unrealized loss on investments in debt and equity securities classified as available-for-sale securities.

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Amount of unrealized loss before deducting unrealized gain on investments in available-for-sale securities.

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