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Convertible Senior Notes (Narrative) (Details) - Convertible Senior Notes [Member] |  |  |  | 1 Months Ended | 6 Months Ended |  |  |
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Jul. 01, 2019 USD ($) item shares | Aug. 24, 2018 USD ($) $ / shares shares | Jun. 30, 2014 USD ($) $ / shares | Jun. 30, 2019 USD ($) $ / shares | Nov. 30, 2018 USD ($) $ / shares | Aug. 31, 2018 USD ($) $ / shares | Jun. 30, 2019 USD ($) $ / shares | Dec. 31, 2018 USD ($) | Mar. 31, 2018 USD ($) | Sep. 30, 2017 USD ($)
Initial Issuance - 2028 Convertible Senior Notes [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Debt instrument, face amount |  | $ 800,000,000 |  |  |  |  |  |  |  |
Additional Issuance - 2028 Convertible Senior Notes [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Debt instrument, face amount |  |  |  |  |  | $ 80,000,000 |  |  |  |
2028 Convertible Senior Notes [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Debt instrument, face amount |  |  |  | $ 880,000,000 |  | $ 880,000,000 | $ 880,000,000 | $ 880,000,000 |  |
Debt instrument, interest rate |  | 2.00% |  | 2.00% |  | 2.00% | 2.00% | 2.00% |  |
Convertible senior notes, conversion rate |  | 2.2553% |  |  |  |  |  |  |  |
Converted instrument, principal amount used per conversion |  | $ 1,000 |  |  |  |  | $ 100 |  |  |
Convertible senior notes, conversion price | $ / shares |  | $ 443.40 |  |  |  |  |  |  |  |
Amount paid to enter into capped call transactions |  |  |  | $ 88,362,000 | $ 11,472,000 | $ 91,784,000 | 88,362,000 |  |  |
Estimated fair value |  |  |  | $ 1,387,267,000 |  |  | $ 1,387,267,000 | $ 787,266,000 |  |
Common stock, closing price per share | $ / shares |  |  |  | $ 611.77 |  |  | $ 611.77 |  |  |
Debt instrument convertible, if-converted value in excess of principal |  |  |  |  |  |  | $ 334,158,000 |  |  |
Strike price, per share | $ / shares |  |  |  | 703.64 | $ 633.87 | $ 443.41 |  |  |  |
Approximate cap price, per share | $ / shares |  |  |  | $ 846.86 | $ 666.72 | $ 656.90 | $ 846.86 |  |  |
2019 Convertible Senior Notes [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Debt instrument, face amount |  |  | $ 330,000,000 | $ 65,978,000 |  |  | $ 65,978,000 | 65,987,000 |  |
Debt instrument, interest rate |  |  | 2.25% | 2.25% |  |  | 2.25% |  |  |
Debt instrument, maturity date |  |  |  |  |  |  | Jul. 01, 2019 |  |  |
Convertible senior notes, conversion rate |  |  | 7.9353% |  |  |  |  |  |  |
Converted instrument, principal amount used per conversion |  |  | $ 1,000 |  |  |  |  |  |  |
Convertible senior notes, conversion price | $ / shares |  |  | $ 126.02 |  |  |  |  |  |  |
Amount paid to enter into capped call transactions |  |  | $ 19,668,000 |  |  |  |  |  | $ 45,692,000 | $ 67,308,000
Debt Conversion, Received And Retired Shares | item | 131,994 |  |  |  |  |  |  |  |  |
Estimated fair value |  |  |  | $ 324,905,000 |  |  | $ 324,905,000 | $ 150,572,000 |  |
Closing Trading Amount Price Per Share | $ / shares |  |  |  |  |  |  | $ 100 |  |  |
Common stock, closing price per share | $ / shares |  |  |  | $ 611.77 |  |  | $ 611.77 |  |  |
Amount of debt extinguished |  | $ 263,724,000 |  |  |  |  |  |  |  |
Cash payment for debt extinguishment |  | $ 348,123,000 |  |  |  |  |  |  |  |
Shares issued related to the debt extinguishment | shares |  | 1,044,298 |  |  |  |  |  |  |  |
Unwind of convertible note cappeds calls |  |  |  |  | $ 14,405,000 | $ 121,703,000 |  |  |  |
Debt instrument convertible, if-converted value in excess of principal |  |  |  |  |  |  | $ 254,317,000 |  |  |
2019 Convertible Senior Notes [Member] | Subsequent Events [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Debt Conversion, Converted Instrument, Amount Not Converted | $ 17,000 |  |  |  |  |  |  |  |  |
Convertible senior notes, amount converted | $ 65,961,000 |  |  |  |  |  |  |  |  |
Debt Conversion, Converted Instrument, Shares Issued | shares | 523,407 |  |  |  |  |  |  |  |  |

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