Financial Instruments and Fair Value Measurements - Carrying Amount and Fair Value of Financial Instruments (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Senior Notes held by special purpose entity	$ 176,537	$ 176,310
Carrying Value \| Level 1
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
U.S. Treasury securities and cash equivalents	7,989	8,590
Carrying Value \| Level 3
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Retained interest investments	11,147	10,635
Time deposit	200,000	200,000
Senior Notes held by special purpose entity	176,537	176,310
Fair Value \| Level 1
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
U.S. Treasury securities and cash equivalents	7,797	8,398
Fair Value \| Level 3
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Retained interest investments	14,106	13,669
Time deposit	200,000	200,000
Senior Notes held by special purpose entity	$ 198,530	$ 199,691

Investments Held By Special Purpose Entities, Fair Value Disclosure

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- Definition

Senior Notes Held By Special Purpose Entity

+ References

No definition available.

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- Definition

Time Deposits Held By Special Purpose Entities, Fair Value Disclosure

+ References

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

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- Definition

Fair value portion of interest continued to be held by a transferor after transferring financial assets to a third party.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 860
-SubTopic 10
-Section 15
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=77996609&loc=d3e94415-111705

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