| **Financial Instruments and Fair Value Measurements (Tables)**                | 9 Months Ended                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                       |
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| **Fair Value Disclosures [Abstract]**                                         |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                 |
| Schedule of Financial Instruments Measured at Fair Value on a Recurring Basis | The financial instruments measured at fair value on a recurring basis at September 30, 2013 were as follows: Level 1 Level 2 Level 3 Total Fair ValueMoney market funds$2,444 $— $— $2,444Debt securities:       U.S. treasury securities124,973 — — 124,973Corporate debt securities— 21,078 — 21,078 $127,417 $21,078 $— $148,495                                                                                                                           |
| Carrying Amount and Fair Value of Financial Instruments                       | The carrying amount and fair value of the Company’s financial instruments were as follows (the table below excludes financial instruments with carrying values that approximate their fair values): September 30, 2013 December 31, 2012 Carrying value Fair value Level Carrying value Fair value LevelAssets           Pledged treasury securities$26,404 $28,965 1 $26,818 $30,432 1Retained interest investment$9,567 $12,711 3 $9,481 $12,392 3 |

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| - Definition
Schedule Of Carrying Amounts And Fair Values Of Financial Instruments Table
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No definition available.
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| - Definition
Tabular disclosure of assets and liabilities, including [financial] instruments measured at fair value that are classified in stockholders' equity, if any, that are measured at fair value on a recurring basis. The disclosures contemplated herein include the fair value measurements at the reporting date by the level within the fair value hierarchy in which the fair value measurements in their entirety fall, segregating fair value measurements using quoted prices in active markets for identical assets (Level 1), significant other observable inputs (Level 2), and significant unobservable inputs (Level 3).
+ References
Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=7578670&loc=d3e19190-110258
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