Term Loan - Narrative (Details) - USD ($)
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3 Months Ended |
6 Months Ended |
15 Months Ended |
Feb. 10, 2017 |
Nov. 10, 2015 |
Jun. 30, 2017 |
Jun. 30, 2016 |
Jun. 30, 2017 |
Jun. 30, 2016 |
Feb. 10, 2017 |
| Debt Instrument [Line Items] |
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| Term loan |
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$ 147,375,000
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$ 147,375,000
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| Debt issuance cost |
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370,000
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$ 0
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| Interest expense |
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3,300,000
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$ 3,707,000
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6,794,000
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$ 7,339,000
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| Senior Secured Debt | Credit Agreement |
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| Debt Instrument [Line Items] |
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| Debt instrument term |
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3 years
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| Debt instrument, face amount |
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$ 150,000,000
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| Debt instrument, extension of term |
1 year
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| Periodic payment of principal |
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375,000
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| Term loan |
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$ 147,400,000
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$ 147,400,000
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| Debt issuance cost |
$ 370,000
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$ 4,800,000
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| Percentage of debt discount |
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1.00%
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| Debt instrument covenant, maximum debt-to-total capitalization ratio |
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35.00%
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| Debt instrument covenant, maximum risk-to-capital ratio |
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22.0
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| Debt instrument covenant, minimum liquidity requirement |
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$ 28,600,000
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| Senior Secured Debt | Credit Agreement | Eurodollar |
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| Debt Instrument [Line Items] |
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| Variable rate floor |
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1.00%
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| Basis spread on variable rate |
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6.75%
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| Interest rate during period |
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7.87%
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