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Fair Value Measurement (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Summary of marketable securities consist of investments
Cost	$ 8,735	$ 7,295
Gross Unrealized Gains	22	16
Recorded Basis	16,748	16,878
Current Available-for-sale [Member]
Summary of marketable securities consist of investments
Cost	16,728	16,874
Gross Unrealized Gains	20	4
Recorded Basis	16,748	16,878
Long-term Available-for-sale [Member]
Summary of marketable securities consist of investments
Cost	9,870	15,428
Gross Unrealized Gains	29	(33)
Recorded Basis	9,899	15,395
Municipal bonds [Member]
Summary of marketable securities consist of investments
Cost	4,920	5,580
Gross Unrealized Gains	17	17
Recorded Basis	4,937	5,597
Fair Value Category	2
Municipal bonds [Member] | Current Available-for-sale [Member]
Summary of marketable securities consist of investments
Cost	409	5,804
Gross Unrealized Gains	1	8
Recorded Basis	410	5,812
Fair Value Category	2
Municipal bonds [Member] | Long-term Available-for-sale [Member]
Summary of marketable securities consist of investments
Cost	292	0
Gross Unrealized Gains	1	0
Recorded Basis	293	0
Fair Value Category	2
Corporate bonds [Member]
Summary of marketable securities consist of investments
Cost	2,035	148
Gross Unrealized Gains	5	(1)
Recorded Basis	2,040	147
Fair Value Category	2
Corporate bonds [Member] | Current Available-for-sale [Member]
Summary of marketable securities consist of investments
Cost	14,764	11,070
Gross Unrealized Gains	16	(4)
Recorded Basis	14,780	11,066
Fair Value Category	2
Corporate bonds [Member] | Long-term Available-for-sale [Member]
Summary of marketable securities consist of investments
Cost	9,111	14,971
Gross Unrealized Gains	28	(33)
Recorded Basis	9,139	14,938
Fair Value Category	2
Corporate bonds [Member] | Held-to-maturity [Member]
Summary of marketable securities consist of investments
Cost	467	457
Gross Unrealized Gains	0	0
Recorded Basis	467	457
Fair Value Category	2
U.S. Treasuries [Member]
Summary of marketable securities consist of investments
Cost	1,780	1,567
Gross Unrealized Gains	0	0
Recorded Basis	1,780	1,567
Fair Value Category	1
U.S. Treasuries [Member] | Current Available-for-sale [Member]
Summary of marketable securities consist of investments
Cost	1,555	0
Gross Unrealized Gains	3	0
Recorded Basis	1,558	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



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-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 2

-Article 5

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