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Debt and Credit Agreements - Schedule of Long-term Debt Insturments (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Components of debt balance [Abstract] |  |  |
Long term debt, current portion, net of deferred issuance cost at beginning of period | $ 15,208 |  |
Debt Borrowing, Repayment, Amortization during period [Abstract] |  |  |
Amortization of debt financing fees | 2,292 | $ 1,590 | $ 1,590
Long term debt, current portion, net of deferred issuance cost at end of period | 0 | 15,208 |
Long-term debt, net | 135,417 | 194,917 |
Wells Fargo Bank, National Association |  |  |
Components of 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 | 135,417 | 210,125 |
Long term debt, current portion, net of deferred issuance cost at beginning of period | 15,208 |  |
Debt Borrowing, Repayment, Amortization during period [Abstract] |  |  |
Proceeds from debt | 0 |  |
Debt issuance cost | 0 | (2,106) |
Increase in borrowings net of deferred issuance cost | 0 |  |
Repayment of debt and revolving credit facility | (77,000) |  |
Amortization of debt financing fees | 2,292 | 1,600 | $ 1,600
Decrease in repayment/amortization net of deferred issuance cost | (74,708) |  |
Debt under credit facilities at end of period | 140,000 | 217,000 |
Deferred issuance cost, net at end of period | (4,583) | (6,875) |
Long term debt, current portion, net of deferred issuance cost at end of period | 0 | 15,208 |
Long-term debt, net | 135,417 | 194,917 |
Term Loan Facility | Wells Fargo Bank, National Association |  |  |
Components of debt balance [Abstract] |  |  |
Debt under credit facilities at beginning of period | 182,500 |  |
Debt Borrowing, Repayment, Amortization during period [Abstract] |  |  |
Proceeds from debt | 0 |  |
Repayment of debt and revolving credit facility | (42,500) |  |
Debt under credit facilities at end of period | 140,000 | 182,500 |
Revolving Credit Facility | Wells Fargo Bank, National Association |  |  |
Components of debt balance [Abstract] |  |  |
Debt under credit facilities at beginning of period | 34,500 |  |
Debt Borrowing, Repayment, Amortization during period [Abstract] |  |  |
Proceeds from debt | 0 |  |
Repayment of debt and revolving credit facility | (34,500) |  |
Debt under credit facilities at end of period | $ 0 | $ 34,500 |

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