Debt - Convertible Notes (Details)
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9 Months Ended |
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May 31, 2014
USD ($)
$ / shares
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Sep. 30, 2019
USD ($)
$ / shares
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Dec. 31, 2018
USD ($)
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| Debt Instrument [Line Items] |
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| Unamortized deferred financing costs |
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$ 18,569,000
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$ 14,932,000
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| Convertible Senior Notes |
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| Debt Instrument [Line Items] |
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| Debt discount, value of the embedded conversion premium |
$ 56,700,000
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7,700,000
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13,300,000
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| Unamortized deferred financing costs |
19,600,000
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$ 2,400,000
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$ 4,300,000
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| Convertible Senior Notes | Convertible Senior Notes Due 2019 |
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| Debt Instrument [Line Items] |
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| Aggregate principal amount of debt |
$ 402,500,000
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| Stated interest rate |
2.875%
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| Debt instrument, maturity date |
May 15, 2019
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| Convertible Senior Notes | Convertible Senior Notes Due 2021 |
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| Debt Instrument [Line Items] |
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| Aggregate principal amount of debt |
$ 345,000,000.0
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| Stated interest rate |
3.75%
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| Debt instrument, maturity date |
May 15, 2021
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| Debt conversion ratio |
15.2727
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17.4458
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| Conversion price (in USD per share) | $ / shares |
$ 65.48
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| Premium above public offering price |
22.50%
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| Anti-dilutive cash dividends, exceeding (in USD per share) | $ / shares |
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$ 0.73026
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