Debt - Narrative (Details) - USD ($)
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3 Months Ended |
12 Months Ended |
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May 24, 2018 |
Dec. 31, 2019 |
Sep. 30, 2019 |
Jun. 30, 2019 |
Mar. 31, 2019 |
Dec. 31, 2018 |
Sep. 30, 2018 |
Jun. 30, 2018 |
Mar. 31, 2018 |
Dec. 31, 2019 |
Dec. 31, 2018 |
Dec. 31, 2017 |
Nov. 10, 2015 |
| Debt Instrument [Line Items] |
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| Term loan |
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$ 147,750,000
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$ 147,750,000
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| Interest expense |
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2,974,000
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$ 2,979,000
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$ 3,071,000
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$ 3,061,000
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$ 3,028,000
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$ 2,972,000
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$ 5,560,000
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$ 3,419,000
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$ 12,085,000
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$ 14,979,000
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$ 13,528,000
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| Secured Debt | 2018 Term Loan |
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| Debt Instrument [Line Items] |
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| Debt instrument face amount |
$ 150,000,000
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| Debt instrument term (years) |
5 years
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| Frequency of periodic payment |
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Quarterly
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| Periodic payment of principal |
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$ 400,000
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| Interest expense |
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11,200,000
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| Unamortized issuance cost and original issue discount |
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2,000,000.0
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$ 2,500,000
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$ 2,000,000.0
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$ 2,500,000
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| Debt instrument covenant, maximum debt-to-total capitalization ratio |
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35.00%
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| Secured Debt | 2018 Term Loan | LIBOR |
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| Debt Instrument [Line Items] |
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| Variable rate floor (percent) |
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1.00%
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| Basis spread on variable rate (percent) |
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4.75%
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| Interest rate during period (percent) |
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6.55%
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| Senior Secured Debt | 2015 Term Loan |
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| Debt Instrument [Line Items] |
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| Debt instrument face amount |
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$ 150,000,000
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| Revolving Credit Facility | 2018 Revolving Credit Facility |
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| Debt Instrument [Line Items] |
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| Debt instrument term (years) |
3 years
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| Credit facility borrowing capacity |
$ 85,000,000
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| Borrowings outstanding |
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0
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$ 0
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| Debt instrument covenant, maximum debt-to-total capitalization ratio |
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35.00%
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| Commitment fee (percent) |
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0.40%
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| Commitment fees in interest expense |
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$ 400,000
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| Deferred debt issuance costs |
$ 1,500,000
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| Amortization of deferred issuance costs |
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500,000
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| Remaining deferred issuance costs, net of accumulated amortization |
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$ 700,000
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$ 700,000
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| Revolving Credit Facility | 2018 Revolving Credit Facility | Minimum |
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| Debt Instrument [Line Items] |
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| Commitment fee (percent) |
0.30%
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| Revolving Credit Facility | 2018 Revolving Credit Facility | Maximum |
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| Debt Instrument [Line Items] |
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| Commitment fee (percent) |
0.60%
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| Revolving Credit Facility | 2018 Revolving Credit Facility | Base Rate |
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| Debt Instrument [Line Items] |
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| Variable rate floor (percent) |
1.00%
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| Revolving Credit Facility | 2018 Revolving Credit Facility | Base Rate | Minimum |
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| Debt Instrument [Line Items] |
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| Basis spread on variable rate (percent) |
1.00%
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| Revolving Credit Facility | 2018 Revolving Credit Facility | Base Rate | Maximum |
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| Debt Instrument [Line Items] |
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| Basis spread on variable rate (percent) |
2.50%
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| Revolving Credit Facility | 2018 Revolving Credit Facility | Eurodollar |
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| Debt Instrument [Line Items] |
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| Variable rate floor (percent) |
0.00%
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| Revolving Credit Facility | 2018 Revolving Credit Facility | Eurodollar | Minimum |
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| Debt Instrument [Line Items] |
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| Basis spread on variable rate (percent) |
2.00%
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| Revolving Credit Facility | 2018 Revolving Credit Facility | Eurodollar | Maximum |
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| Debt Instrument [Line Items] |
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| Basis spread on variable rate (percent) |
3.50%
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