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Fair Value Measurement (Details 1) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Summary of company's restricted marketable securities
Cost	$ 9,559	$ 8,735
Gross Unrealized Gains	27	22
Recorded Basis	9,586	8,757
Municipal bonds [Member]
Summary of company's restricted marketable securities
Cost	5,107	4,920
Gross Unrealized Gains	22	17
Recorded Basis	5,129	4,937
Fair Value Category		2
Corporate bonds [Member]
Summary of company's restricted marketable securities
Cost	2,360	2,035
Gross Unrealized Gains	5	5
Recorded Basis	2,365	2,040
Fair Value Category		2
U.S. treasuries [Member]
Summary of company's restricted marketable securities
Cost	2,092	1,780
Gross Unrealized Gains	0	0
Recorded Basis	2,092	1,780
Fair Value Category		$ 1

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Fair value category.

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This item represents the cost of debt and equity 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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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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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The net amount of gross unrealized gains (losses) for securities, at a point in time, which are categorized neither as held-to-maturity nor trading securities.

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

-Publisher FASB

-Name Accounting Standards Codification

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The carrying amount of securities categorized neither as held-to-maturity nor trading which serve as security for borrowings or other arrangements.

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-Publisher SEC

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