Financial Instruments and Fair Value Measurements - Carrying Amount and Fair Value of Financial Instruments (Details) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Senior notes held by special purpose entity	$ 176,479	$ 176,310
Carrying Value \| Level 3
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Retained interest investments	11,012	10,635
Time deposit	200,000	200,000
Senior notes held by special purpose entity	176,479	176,310
Carrying Value \| Level 1
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
U.S. Treasury securities and cash equivalents	7,942	8,590
Fair Value \| Level 3
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Retained interest investments	13,951	13,669
Time deposit	200,000	200,000
Senior notes held by special purpose entity	199,730	199,691
Fair Value \| Level 1
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
U.S. Treasury securities and cash equivalents	$ 7,821	$ 8,398

Senior Notes Held By Special Purpose Entity

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- Definition

Time Deposits Held By Special Purpose Entities, Fair Value Disclosure

+ References

No definition available.

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- Definition

U.S. Treasury Securities and Cash Equivalents Held By Special Purpose Entities, Fair Value Disclosure

+ References

No definition available.

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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

No definition available.

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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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