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