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Debt - Schedule of Amounts Borrowed Under Wells Fargo Revolving Credit Agreement (Details) - Wells Fargo Credit Agreement - Wells Fargo Revolving Credit Facility - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014 | Mar. 31, 2017
Line of Credit Facility [Line Items] |  |  |  |  |
Average borrowings under Wells Fargo Revolving Credit Facility | $ 26,662 | $ 44,335 | $ 96,390 | $ 53,250 |
Average Interest Cost on Wells Fargo Revolving Credit Facility | 6.85% | 2.75% | 1.96% | 2.36% |
Accrued and unpaid interest | $ 90 | $ 24 | $ 86 | $ 105 |
Available revolving line of credit balance | $ 13,000 |  |  |  | $ 40,000
Prime Rate |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Wells Fargo Prime Rate (Base Rate) loan interest rate | 6.00% | 4.25% | 3.50% | 3.25% |
LIBOR |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
LIBOR loan interest rate | 4.51% | 2.71% | 1.84% | 1.66% |

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