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Fair Value Measurement (Details) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2012	Dec. 31, 2011
Summary of marketable securities consist of investments
Recorded Basis	$ 14,240	$ 16,878
Current Available-for-sale [Member]
Summary of marketable securities consist of investments
Cost	14,227	16,874
Gross Unrealized Gains (Losses)	13	4
Recorded Basis	14,240	16,878
Long-term Available-for-sale [Member]
Summary of marketable securities consist of investments
Cost	17,419	15,428
Gross Unrealized Gains (Losses)	20	(33)
Recorded Basis	17,439	15,395
Municipal bonds [Member] | Current Available-for-sale [Member]
Summary of marketable securities consist of investments
Cost	3,374	5,804
Gross Unrealized Gains (Losses)	4	8
Recorded Basis	3,378	5,812
Fair Value Category	2
Municipal bonds [Member] | Long-term Available-for-sale [Member]
Summary of marketable securities consist of investments
Cost	299	0
Gross Unrealized Gains (Losses)	0	0
Recorded Basis	299	0
Fair Value Category	2
Corporate bonds [Member] | Current Available-for-sale [Member]
Summary of marketable securities consist of investments
Cost	10,853	11,070
Gross Unrealized Gains (Losses)	9	(4)
Recorded Basis	10,862	11,066
Fair Value Category	2
Corporate bonds [Member] | Long-term Available-for-sale [Member]
Summary of marketable securities consist of investments
Cost	15,100	14,971
Gross Unrealized Gains (Losses)	18	(33)
Recorded Basis	15,118	14,938
Fair Value Category	2
Corporate bonds [Member] | Held-to-maturity [Member]
Summary of marketable securities consist of investments
Cost	462	457
Gross Unrealized Gains (Losses)	0	0
Recorded Basis	462	457
Fair Value Category	2
U.S. treasuries [Member] | Long-term Available-for-sale [Member]
Summary of marketable securities consist of investments
Cost	1,558	0
Gross Unrealized Gains (Losses)	2	0
Recorded Basis	$ 1,560	$ 0
Fair Value Category	1

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- Definition

Fair value category.

+ References

No definition available.

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- Definition

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.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.2)

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682



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-Publisher FASB

-Name FASB Staff Position (FSP)

-Number FAS115-1/124-1

-Paragraph 7

-Footnote 2

-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 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 115

-Paragraph 19

-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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- Definition

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.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 320

-SubTopic 10

-Section 50

-Paragraph 9

-Subparagraph (d)

-URI http://asc.fasb.org/extlink&oid=6872113&loc=d3e27357-111563

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- Definition

Total debt and equity financial instruments including: (1) securities held-to-maturity, (2) trading securities, and (3) securities available-for-sale which are intended to be held for less than one year or the normal operating cycle, whichever is longer.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section 45

-Paragraph 1

-Subparagraph (f)

-URI http://asc.fasb.org/extlink&oid=6361293&loc=d3e6676-107765



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.2)

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682



Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 320

-SubTopic 10

-Section 45

-Paragraph 2

-URI http://asc.fasb.org/extlink&oid=6871852&loc=d3e26626-111562



Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 2

-Article 5

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