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Debt - Wells Fargo Credit Agreement - Narrative (Details) | Jun. 28, 2016 USD ($) | Apr. 29, 2015 USD ($) | Apr. 01, 2014 USD ($) | Jun. 28, 2013 USD ($) | Dec. 31, 2017 USD ($) | Oct. 03, 2017 USD ($) | Jul. 17, 2017 USD ($) | Mar. 31, 2017 USD ($) | Dec. 31, 2016 USD ($) | Dec. 19, 2016 USD ($) | Dec. 31, 2015 USD ($) | Feb. 11, 2015 USD ($) | Dec. 31, 2014 USD ($) | Sep. 30, 2014 USD ($)
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Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt issuance costs |  |  |  |  | $ 900,000 |  |  |  | $ 17,200,000 |  | $ 1,500,000 |  | $ 200,000 |
Wells Fargo Credit Agreement |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Lender fees | $ 200,000 |  |  |  |  |  |  | $ 700,000 |  | $ 100,000 |  |  |  |
Wells Fargo Credit Agreement | Term Loan |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate, effective percentage |  | 4.67% |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, face amount |  | $ 3,500,000.0 | $ 5,000,000.0 |  |  |  |  |  |  |  |  |  |  |
Wells Fargo Credit Agreement | LIBOR | Term Loan |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basis spread on variable rate |  | 4.50% | 4.50% |  |  |  |  |  |  |  |  |  |  |
Wells Fargo Credit Agreement | Revolving Credit Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum borrowing capacity | $ 75,000,000 |  | $ 90,000,000.0 | $ 75,000,000.0 |  | $ 58,750,000.00 | $ 52,500,000.0 | $ 65,000,000 |  |  |  | $ 125,000,000.0 |  | $ 100,000,000
Line of credit facility, increase limit |  |  |  | $ 100,000,000.0 |  |  | $ 12,500,000.0 |  |  |  |  |  |  |
Unused line fee percentage |  |  |  | 0.25% |  |  |  |  |  |  |  |  |  |
Debt covenant, fixed charge coverage ratio, minimum |  |  | 1.2 | 1.0 |  |  |  |  |  |  |  |  |  |
Debt covenant, threshold to report fixed charge coverage ratio, availability amount |  |  |  | $ 9,375,000.000 |  |  |  |  |  |  |  |  |  |
Debt covenant, threshold to report fixed charge coverage ratio, percentage of maximum borrowing capacity |  |  |  | 12.50% |  |  |  |  |  |  |  |  |  |
Debt issuance costs |  |  |  |  | 100,000 |  |  |  | 100,000 |  |  |  |  |
Lender fees |  |  |  |  | $ 700,000 |  |  |  | $ 300,000 |  |  |  | $ 100,000 |
Wells Fargo Credit Agreement | Revolving Credit Facility | Minimum |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of credit facility, increase limit |  |  |  |  |  | $ 6,250,000.00 |  |  |  |  |  |  |  |
Wells Fargo Credit Agreement | Revolving Credit Facility | Minimum | Prime Rate |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basis spread on variable rate |  |  |  | 0.00% |  |  |  |  |  |  |  |  |  |
Wells Fargo Credit Agreement | Revolving Credit Facility | Minimum | LIBOR |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basis spread on variable rate | 1.75% |  |  | 1.50% |  |  |  |  |  |  |  |  |  |
Wells Fargo Credit Agreement | Revolving Credit Facility | Maximum | Prime Rate |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basis spread on variable rate |  |  |  | 0.50% |  |  |  |  |  |  |  |  |  |
Wells Fargo Credit Agreement | Revolving Credit Facility | Maximum | LIBOR |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basis spread on variable rate | 2.25% |  |  | 2.00% |  |  |  |  |  |  |  |  |  |

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