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Debt - Debt Narrative (Details) - USD ($) $ in Millions | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014 | Oct. 01, 2018 | Sep. 30, 2018
Debt Instrument [Line Items] |  |  |  |  |  |
Interest paid | $ 7.8 | $ 6.7 | $ 3.3 | $ 1.1 |  |
Revolving Credit Facility and Senior Notes |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt instrument, interest rate | 7.50% |  |  |  |  |
Wells Fargo Revolving Credit Facility |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Maturity period prior to the final maturity of unsecured senior notes | 60 days |  |  |  |  |
Subsequent Event | Revolving Credit Facility and Senior Notes |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt instrument, interest rate |  |  |  |  | 8.50% | 6.50%
Subsequent Event | Wells Fargo Revolving Credit Facility |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt instrument, interest rate |  |  |  |  |  | 1.00%

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