Debt - Term Loans - Narrative (Details) - USD ($)
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3 Months Ended |
4 Months Ended |
5 Months Ended |
9 Months Ended |
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Sep. 16, 2019 |
Jan. 14, 2019 |
Sep. 30, 2019 |
Apr. 30, 2019 |
Sep. 30, 2019 |
Sep. 30, 2019 |
Sep. 30, 2018 |
Dec. 31, 2018 |
| Debt Instrument [Line Items] |
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| Unamortized deferred financing costs |
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$ 18,569,000
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$ 18,569,000
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$ 18,569,000
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$ 14,932,000
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| (Loss) gain on debt extinguishment |
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$ (5,580,000)
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$ (11,473,000)
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$ 27,092,000
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| Convertible Senior Notes Due 2019 | Convertible Senior Notes |
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| Debt Instrument [Line Items] |
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| Stated interest rate |
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2.875%
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2.875%
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2.875%
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| Term loans | 2015 Term Loan | Unsecured Debt |
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| Debt Instrument [Line Items] |
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| Maximum borrowing capacity |
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420,000,000.0
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| Unamortized deferred financing costs |
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$ 400,000
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| Term loans | A-1 Term Loan | Unsecured Debt |
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| Debt Instrument [Line Items] |
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| Maximum borrowing capacity |
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$ 420,000,000.0
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| Increased borrowing capacity under accordion feature |
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$ 200,000,000.0
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| Credit facility maturity date |
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Mar. 31, 2024
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| Term loans | A-1 Term Loan | Unsecured Debt | LIBOR |
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| Debt Instrument [Line Items] |
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| Basis spread on variable rate |
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1.25%
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1.00%
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| Term loans | A-2 Term Loan | Unsecured Debt |
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| Debt Instrument [Line Items] |
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| Maximum borrowing capacity |
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$ 400,000,000.0
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| Increased borrowing capacity under accordion feature |
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$ 200,000,000.0
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| Ticking fee percentage |
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0.20%
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| Term loans | A-2 Term Loan | Unsecured Debt | LIBOR |
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| Debt Instrument [Line Items] |
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| Basis spread on variable rate |
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1.00%
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| Term loans | A-1 Term Loans and A-2 Term Loans | Unsecured Debt |
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| Debt Instrument [Line Items] |
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| (Loss) gain on debt extinguishment |
$ 5,300,000
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