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Debt - Debt Modification and Loss on Debt Extinguishment (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2016 | Jun. 30, 2016 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Debt Instrument [Line Items] |  |  |  |  |
Deferred financing costs |  |  | $ 513 | $ 81,097 | $ 11,559
Loss on debt extinguishment |  |  | 7,481 | 8,392 | 17,363
Convertible Debt | Exchanged Notes |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Write off of deferred debt issuance costs |  | $ 1,681 |  |  |
Deferred financing costs |  |  |  | 70,800 |
Convertible Debt | Exchanged Notes | General and Administrative Expense |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Loss on modification of debt |  |  |  | 22,800 |
Convertible Debt | Fifth Amendment and Restated Credit Agreement |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Write off of deferred debt issuance costs | $ 15,682 |  |  |  |
Reconciling items |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Loss on debt extinguishment |  |  | $ 7,481 | $ 8,392 | $ 17,363

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- Definition Amount, before accumulated amortization, of debt issuance costs. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=114775744&loc=d3e28555-108399 + Details
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