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Subsequent Event - Senior Credit Facilities (Details) - USD ($) $ in Thousands |  |  | 12 Months Ended |
--- | --- | --- | --- | ---
Jan. 31, 2019 | Jan. 22, 2019 | Dec. 31, 2018 | Dec. 31, 2012 | Feb. 01, 2019
Subsequent Event |  |  |  |  |
Amount of senior credit facilities |  |  | $ 150,000 | $ 50,000 |
Increase to aggregate commitments |  |  |  | $ 100,000 |
Credit Agreement |  |  |  |  |
Subsequent Event |  |  |  |  |
Amount of senior credit facilities |  |  | 250,000 |  |
Increase to aggregate commitments |  |  | 50,000 |  |
Credit Agreement | Maximum |  |  |  |  |
Subsequent Event |  |  |  |  |
Amount of senior credit facilities |  |  | $ 300,000 |  |
Subsequent Event | LIBOR |  |  |  |  |
Subsequent Event |  |  |  |  |
Margin on interest rate |  | 2.00% |  |  |
Subsequent Event | Base rate |  |  |  |  |
Subsequent Event |  |  |  |  |
Margin on interest rate |  | 0.75% |  |  |
Subsequent Event | Federal funds effective rate |  |  |  |  |
Subsequent Event |  |  |  |  |
Margin on interest rate |  | 0.50% |  |  |
Subsequent Event | One month LIBOR |  |  |  |  |
Subsequent Event |  |  |  |  |
Margin on interest rate |  | 1.25% |  |  |
Subsequent Event | Senior secured revolving credit facility |  |  |  |  |
Subsequent Event |  |  |  |  |
Amount of senior credit facilities |  | $ 62,500 |  |  |
Term of senior credit facility |  | 5 years |  |  |
Increase in principal amount of the term loan and revolving commitments |  |  |  |  | $ 18,750
Principal amount of aggregate commitments |  |  |  |  | 81,250
Subsequent Event | First Amendment to the Credit Agreement |  |  |  |  |
Subsequent Event |  |  |  |  |
Amount of senior credit facilities | $ 250,000 |  |  |  |
Increase to aggregate commitments | 75,000 |  |  |  |
Subsequent Event | First Amendment to the Credit Agreement | Maximum |  |  |  |  |
Subsequent Event |  |  |  |  |
Amount of senior credit facilities | $ 325,000 |  |  |  |
Subsequent Event | Senior secured term loan facility |  |  |  |  |
Subsequent Event |  |  |  |  |
Amount of senior credit facilities |  | $ 187,500 |  |  |
Term of senior credit facility |  | 5 years |  |  |
Repayments of Secured Debt |  | $ 60,000 |  |  |
Cash collateral released on repayment of debt |  | $ 61,700 |  |  |
Increase in principal amount of the term loan and revolving commitments |  |  |  |  | 56,250
Principal amount repayment instalment percentage (in percent) |  | 5.00% |  |  |
Quarterly repayment installments of principal amount of the term facility |  | $ 12,188 |  |  |
Principal amount of aggregate commitments |  |  |  |  | $ 243,750

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