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Summary of Significant Accounting Policies Summary of Significant Accounting Policies (Tables) | 12 Months Ended
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Dec. 31, 2012
Summary of Significant Accounting Policies [Abstract] |
Investments Classified by Contractual Maturity Date [Table Text Block] | The schedule of maturities at December 31, 2012 and 2011 are as follows:
| Maturities as of December 31, 2012 |  | Maturities as of December 31, 2011
| 1 Year or Less |  | 1 to 10 Years |  | 1 Year or Less |  | 1 to 8 Years
Corporate bonds | $ | 8,285 |  |  | $ | 73,027 |  |  | $ | 5,659 |  |  | $ | 63,965 |
Certificates of deposit | 8,000 |  |  | 8,175 |  |  | — |  |  | 8,039 |
Total | $ | 16,285 |  |  | $ | 81,202 |  |  | $ | 5,659 |  |  | $ | 72,004 |

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- Definition Tabular disclosure of maturities of an entity's investments as well as any other information pertinent to the investments. + References No definition available. + Details
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