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Fair Value Measurements - Assets Measured at Fair Value on a Non-Recurring Basis (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2018 | Sep. 30, 2017 | Dec. 31, 2018 | Dec. 31, 2017
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Goodwill - total reduction in fair value recorded |  | $ (18,000) | $ (18,026) | $ (18,026)
Property and equipment - total reduction in fair value recorded | $ (34,300) |  | (34,288) |
Non-recurring |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Goodwill | 598 |  | 598 |
Property and equipment | 0 |  | 0 |
Level 1 | Non-recurring |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Goodwill | 0 |  | 0 |
Property and equipment | 0 |  | 0 |
Level 2 | Non-recurring |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Goodwill | 0 |  | 0 |
Property and equipment | 0 |  | 0 |
Level 3 | Non-recurring |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Goodwill | 598 |  | 598 |
Property and equipment | $ 0 |  | $ 0 |

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- Definition Fair value portion of asset representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=99377789&loc=d3e19190-110258 + Details
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