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Debt - Components of Debt (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017 | Dec. 31, 2017
Components of beginning debt balance [Abstract] |  |  |  |  |
Long term debt, current portion, net of deferred issuance cost at beginning of period | $ 17,708 |  | $ 17,708 |  | $ 15,208
Long-term debt, net | 167,135 |  | 167,135 |  | 194,917
Debt Borrowing, Repayment, Amortization during period [Abstract] |  |  |  |  |
Repayment of debt and revolving credit facility |  |  | (27,000) | $ (100,000) |
Amortization of deferred issuance cost | 600 | $ 400 | 1,718 | $ 1,192 |
Components of ending debt balance [Abstract] |  |  |  |  |
Long-term debt, current portion, net | 17,708 |  | 17,708 |  | 15,208
Long term debt, net of deferred issuance cost at end of period | 167,135 |  | 167,135 |  | 194,917
Wells Fargo Bank, National Association |  |  |  |  |
Components of beginning debt balance [Abstract] |  |  |  |  |
Debt under credit facilities at beginning of period |  |  | 217,000 |  |
Deferred issuance cost, net at beginning of period |  |  | (6,875) |  |
Total Debt, net of deferred issuance cost at beginning of period |  |  | 210,125 |  |
Long term debt, current portion, net of deferred issuance cost at beginning of period | 17,708 |  | 17,708 |  | 15,208
Long-term debt, net | 167,135 |  | 167,135 |  | 194,917
Debt Borrowing, Repayment, Amortization during period [Abstract] |  |  |  |  |
Proceeds from lines of credit |  |  | 0 |  |
Deferred issuance cost, gross |  |  | 0 |  |
Increase in borrowings net of deferred issuance cost |  |  | 0 |  |
Repayment of debt and revolving credit facility |  |  | (27,000) |  |
Amortization of deferred issuance cost |  |  | 1,718 |  |
Decrease in repayment/amortization net of deferred issuance cost |  |  | (25,282) |  |
Components of ending debt balance [Abstract] |  |  |  |  |
Debt under credit facilities at end of period | 190,000 |  | 190,000 |  |
Deferred issuance cost, net at end of period | (5,157) |  | (5,157) |  |
Total Debt, net of deferred issuance cost at end of period | 184,843 |  | 184,843 |  |
Long-term debt, current portion, net | 17,708 |  | 17,708 |  | 15,208
Long term debt, net of deferred issuance cost at end of period | 167,135 |  | 167,135 |  | $ 194,917
Wells Fargo Bank, National Association | Term Loan Facility |  |  |  |  |
Components of beginning debt balance [Abstract] |  |  |  |  |
Debt under credit facilities at beginning of period |  |  | 182,500 |  |
Debt Borrowing, Repayment, Amortization during period [Abstract] |  |  |  |  |
Proceeds from lines of credit |  |  | 0 |  |
Repayment of debt and revolving credit facility |  |  | (12,500) |  |
Components of ending debt balance [Abstract] |  |  |  |  |
Debt under credit facilities at end of period | 170,000 |  | 170,000 |  |
Wells Fargo Bank, National Association | Revolving Credit Facility |  |  |  |  |
Components of beginning debt balance [Abstract] |  |  |  |  |
Debt under credit facilities at beginning of period |  |  | 34,500 |  |
Debt Borrowing, Repayment, Amortization during period [Abstract] |  |  |  |  |
Proceeds from lines of credit |  |  | 0 |  |
Repayment of debt and revolving credit facility |  |  | (14,500) |  |
Components of ending debt balance [Abstract] |  |  |  |  |
Debt under credit facilities at end of period | $ 20,000 |  | $ 20,000 |  |

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