| **Financial Instruments and Fair Value Measurements - Carrying Amount and Fair Value of Financial Instruments (Details) (USD $)In Thousands, unless otherwise specified** | Sep. 30, 2013 | Dec. 31, 2012 |
|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------|---------------|---------------|
| **Fair Value Measurements [Line Items]**                                                                                                                                  |          |          |
| Pledged treasury securities, Carrying value                                                                                                                               | $ 26,404      | $ 26,818      |
| Retained interest investment, Carrying value                                                                                                                              | 9,600         | 9,500         |
| Level 1                                                                                                                                                                   |          |          |
| **Fair Value Measurements [Line Items]**                                                                                                                                  |          |          |
| Pledged treasury securities, Carrying value                                                                                                                               | 26,404        | 26,818        |
| Pledged treasury securities, Fair value                                                                                                                                   | 28,965        | 30,432        |
| Level 3                                                                                                                                                                   |          |          |
| **Fair Value Measurements [Line Items]**                                                                                                                                  |          |          |
| Retained interest investment, Carrying value                                                                                                                              | 9,567         | 9,481         |
| Retained interest investment, Fair value                                                                                                                                  | $ 12,711      | $ 12,392      |

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| - Definition
Retained Interest
+ References
No definition available.
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| - Definition
The carrying amount of securities categorized as held-to-maturity which serve as security for borrowings or other arrangements.
+ References
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| - Definition
This element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. This item represents the interests continued to be held by a transferor (retained or residual interest) after transferring financial assets to a third party.
+ References
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| - Definition
Fair value of financial instrument held by the entity for its own account (proprietary securities) for trading or investment purposes that are carried at fair value and pledged to counterparties as collateral for financing transactions.
+ References
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