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Net Income (Loss) Per Share (Narrative) (Details) - Convertible Senior Notes [Member] - USD ($) | Jun. 30, 2019 | Dec. 31, 2018 | Aug. 31, 2018 | Aug. 24, 2018 | Jun. 30, 2014
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2019 Convertible Senior Notes [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Convertible senior notes, issued | $ 65,978,000 | $ 65,987,000 |  |  | $ 330,000,000
Convertible senior notes, interest rate | 2.25% |  |  |  | 2.25%
2028 Convertible Senior Notes [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Convertible senior notes, issued | $ 880,000,000 | $ 880,000,000 | $ 880,000,000 |  |
Convertible senior notes, interest rate | 2.00% | 2.00% | 2.00% | 2.00% |

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