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Convertible Senior Notes (Carrying Amounts of Liability and Equity Components) (Details) - Convertible Senior Notes [Member] - USD ($) | Jun. 30, 2019 | Dec. 31, 2018 | Aug. 31, 2018 | Jun. 30, 2014
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2028 Convertible Senior Notes [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Amount of the equity component | [1] | $ 327,305,000 | $ 327,305,000 |  |
Convertible senior notes |  | 880,000,000 | 880,000,000 | $ 880,000,000 |
Unamortized debt discount | [2] | (313,498,000) | (325,783,000) |  |
Unamortized transaction costs related to the debt component |  | (9,719,000) | (9,958,000) |  |
Contractual coupon interest accrual |  | 15,009,000 | 5,867,000 |  |
Contractual coupon interest payment |  | (8,360,000) |  |  |
Net carrying amount |  | 563,432,000 | 550,126,000 |  |
2019 Convertible Senior Notes [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Amount of the equity component | [3] | 9,196,000 | 9,196,000 |  |
Convertible senior notes |  | 65,978,000 | 65,987,000 |  | $ 330,000,000
Unamortized debt discount |  |  | (1,063,000) |  |
Unamortized transaction costs related to the debt component |  |  | (176,000) |  |
Contractual coupon interest accrual |  | 745,000 | 5,447,000 |  |
Contractual coupon interest payment |  | (745,000) | (5,447,000) |  |
Net carrying amount |  | $ 65,978,000 | $ 64,748,000 |  |
[1] | Net of $6,163 thousands of transaction costs related to the equity component of the 2028 Notes.
[2] | As of June 30, 2019, the remaining period over which the unamortized debt discount will be amortized is 9.2 years.
[3] | Net of $236 thousands of transaction costs related to the equity component of the 2019 Notes.

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