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Investments and Fair Value Measurements (Tables) | 12 Months Ended
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Dec. 31, 2012
Investments and Fair Value Measurements [Abstract] |
Schedule of investments |
|  | 2012 |  |  | 2011 |
|  | Held-to- Maturity |  |  | Held-to- Maturity |
Federal agency debt instruments |  | $ | 11,036 |  |  | $ | 9,056 |
Schedule of unrealized gains, losses, and fair value of investments |
|  | 2012 |  |  | 2011 |
|  | Held-to- Maturity |  |  | Held-to- Maturity |
Cost/amortized cost |  | $ | 11,036 |  |  | $ | 9,056 |
Gross unrealized gains |  |  | 61 |  |  |  | 53 |
Gross unrealized losses |  |  | (157 | ) |  |  | (112 | )
Fair value |  | $ | 10,940 |  |  | $ | 8,997 |
Schedule of maturity profile of investments |
|  | 2012 |  |  | 2011 |
|  | Held-to- Maturity |  |  | Held-to- Maturity |
Due within one year |  | $ | — |  |  | $ | — |
Due one year through five years |  |  | — |  |  |  | 250 |
Due five years through ten years |  |  | 727 |  |  |  | 1,134 |
Due over ten years |  |  | 10,309 |  |  |  | 7,672 |
Total |  | $ | 11,036 |  |  | $ | 9,056 |

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- Definition Tabular disclosure of all investments in certain debt and equity securities for which the entity has the positive intent and ability to hold until maturity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 9 -URI http://asc.fasb.org/extlink&oid=6435544&loc=d3e41834-113960 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=7512638&loc=d3e5086-111524 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 115 -Paragraph 137 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6872113&loc=d3e27232-111563 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=6872113&loc=d3e27337-111563 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=6872113&loc=d3e27405-111563 Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 320 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6957658&loc=d3e62586-112803 Reference 8: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 320 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6957658&loc=d3e62557-112803 Reference 9: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6872113&loc=d3e27290-111563 + Details
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