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Debt - Wells Fargo Credit Agreement - Amendments (Details) |  |  |  |  |  |  |  |  | 12 Months Ended |  |  |  |  |  |
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Mar. 29, 2018 USD ($) | Jul. 17, 2017 USD ($) | Mar. 31, 2017 USD ($) | Jan. 27, 2017 | Jun. 28, 2016 USD ($) | Apr. 29, 2015 USD ($) | Apr. 01, 2014 USD ($) | Jun. 28, 2013 USD ($) | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($) | Dec. 31, 2014 USD ($) | Oct. 01, 2018 USD ($) | Oct. 03, 2017 USD ($) | Dec. 19, 2016 USD ($) | Aug. 22, 2016 USD ($) | Feb. 11, 2015 USD ($) | Sep. 30, 2014 USD ($)
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Repayments of long-term debt |  |  |  |  |  |  |  |  | $ 71,400,000 |  | $ 4,028,000 | $ 972,000 |  |  |  |  |  |
Wells Fargo Credit Agreement |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Lender fees |  |  | $ 700,000 |  | $ 200,000 |  |  |  |  |  |  |  |  |  | $ 100,000 |  |  |
Reserve against borrowing base availability |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 12,500,000 | $ 12,500,000 |  |
Reserve against borrowing base availability upon filing delinquent reports |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 7,500,000 |  |
Wells Fargo Credit Agreement | Subsequent Event |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Lender fees | $ 800,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Wells Fargo Credit Agreement | Term Loan |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, face amount |  |  |  |  |  | $ 3,500,000.0 | $ 5,000,000.0 |  |  |  |  |  |  |  |  |  |  |
Debt instrument, term |  |  |  |  |  |  | 36 months |  |  |  |  |  |  |  |  |  |  |
Repayments of long-term debt |  |  |  |  |  | $ 5,000,000 |  |  |  |  |  |  |  |  |  |  |  |
Wells Fargo Credit Agreement | Term Loan | LIBOR |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basis spread on variable rate |  |  |  |  |  | 4.50% | 4.50% |  |  |  |  |  |  |  |  |  |  |
Revolving Credit Facility | Wells Fargo Credit Agreement |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum borrowing capacity |  | $ 52,500,000.0 | $ 65,000,000 |  | $ 75,000,000 |  | $ 90,000,000.0 | $ 75,000,000.0 |  |  |  |  |  | $ 58,750,000.00 |  |  | $ 125,000,000.0 | $ 100,000,000
Debt covenant, fixed charge coverage ratio, minimum |  |  |  |  |  |  | 1.2 | 1.0 |  |  |  |  |  |  |  |  |  |
Debt covenant, debt leverage ratio, maximum |  |  |  |  |  |  | 4.0 |  |  |  |  |  |  |  |  |  |  |
Lender fees |  |  |  |  |  |  |  |  | 700,000 | $ 300,000 |  | $ 100,000 |  |  |  |  |  |
Commitment fee percentage |  | 1.00% |  | 1.00% | 2.00% |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate increase |  |  | 2.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of credit facility, decrease limit |  |  | $ 25,000,000.0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Available revolving line of credit balance |  |  | $ 40,000,000 |  |  |  |  |  | $ 13,000,000 |  |  |  |  |  |  |  |  |
Line of credit facility, increase limit |  | $ 12,500,000.0 |  |  |  |  |  | $ 100,000,000.0 |  |  |  |  |  |  |  |  |  |
Decrease in interest rate margin |  | (1.00%) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maturity, period prior to senior notes maturity |  |  |  |  |  |  |  |  | 60 days |  |  |  |  |  |  |  |  |
Revolving Credit Facility | Wells Fargo Credit Agreement | Subsequent Event |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum borrowing capacity | $ 75,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commitment fee percentage | 1.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maturity, period prior to senior notes maturity | 60 days |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of borrowing base | 10.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revolving Credit Facility | Wells Fargo Credit Agreement | Subsequent Event | Forecast |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of credit facility, increase limit |  |  |  |  |  |  |  |  |  |  |  |  | $ 9,000,000.0 |  |  |  |  |
Revolving Credit Facility | Wells Fargo Credit Agreement | Minimum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of credit facility, increase limit |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 6,250,000.00 |  |  |  |
Revolving Credit Facility | Wells Fargo Credit Agreement | Minimum | Subsequent Event |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of credit facility, increase limit | $ 6,500,000.0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revolving Credit Facility | Wells Fargo Credit Agreement | Maximum | Subsequent Event |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of credit facility, increase limit | $ 7,500,000.0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revolving Credit Facility | Wells Fargo Credit Agreement | LIBOR | Minimum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basis spread on variable rate |  |  |  |  | 1.75% |  |  | 1.50% |  |  |  |  |  |  |  |  |  |
Revolving Credit Facility | Wells Fargo Credit Agreement | LIBOR | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basis spread on variable rate |  |  |  |  | 2.25% |  |  | 2.00% |  |  |  |  |  |  |  |  |  |

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