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Debt - TPG Term Loan - Narrative (Details) - USD ($) |  |  |  | 1 Months Ended | 2 Months Ended | 3 Months Ended | 6 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Feb. 06, 2017 | Aug. 22, 2016 | Jun. 28, 2016 | Mar. 31, 2017 | Feb. 28, 2017 | Mar. 31, 2017 | Mar. 31, 2016 | Jun. 30, 2017 | Jun. 30, 2016 | Sep. 30, 2017 | Sep. 30, 2016 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt issuance costs |  |  |  |  |  |  |  |  |  |  |  | $ 900,000 | $ 17,200,000 | $ 1,500,000 | $ 200,000
Loss on debt extinguishment and modifications |  |  |  |  |  | $ 11,921,000 | $ 0 | $ 11,921,000 | $ 0 | $ 11,921,000 | $ 25,000 | 11,921,000 | 357,000 | $ 12,000 | $ 0
Term Loan | TPG Term Loan |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, face amount |  |  | $ 60,000,000.0 |  |  |  |  |  |  |  |  |  |  |  |
Debt default, basis spread on interest rate | 2.00% |  | 2.00% |  |  |  |  |  |  |  |  |  |  |  |
Maturity, period prior to senior notes maturity |  |  | 90 days |  |  |  |  |  |  |  |  |  |  |  |
Lender fees |  |  | $ 1,300,000 |  |  |  |  |  |  |  |  |  | 2,300,000 |  |
Deferred costs |  |  | $ 1,600,000 |  |  |  |  |  |  |  |  |  |  |  |
Amendment fee |  | $ 3,000,000 |  | $ 6,100,000 | $ 5,100,000 |  |  |  |  |  |  |  | 11,400,000 |  |
Debt issuance costs |  |  |  | 400,000 |  | $ 400,000 |  |  |  |  |  | $ 400,000 | $ 400,000 |  |
Interest rate, effective percentage |  |  | 10.75% |  |  |  |  |  |  |  |  |  | 10.84% |  |
Accrued unpaid interest |  |  |  |  |  |  |  |  |  |  |  |  | $ 1,200,000 |  |
Loss on debt extinguishment and modifications |  |  |  | $ (11,900,000) |  |  |  |  |  |  |  |  |  |  |
Term Loan | TPG Term Loan | September 30, 2017 to June 30, 2018 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Periodic payment, principal |  |  | $ 375,000 |  |  |  |  |  |  |  |  |  |  |  |
Term Loan | TPG Term Loan | After June 30, 2018 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Periodic payment, principal |  |  | $ 750,000 |  |  |  |  |  |  |  |  |  |  |  |
Term Loan | TPG Term Loan | LIBOR |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basis spread on variable rate |  |  | 9.75% |  |  |  |  |  |  |  |  |  | 9.75% |  |
Secured Debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum borrowing capacity |  |  | $ 135,000,000 |  |  |  |  |  |  |  |  |  |  |  |

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