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Financial Statements (Details) - USD ($) $ / shares in Units, $ in Thousands |  |  |  |  | 6 Months Ended
--- | --- | --- | --- | --- | ---
May 06, 2016 | May 02, 2016 | Feb. 24, 2016 | Feb. 19, 2016 | Jun. 30, 2016 | Jun. 30, 2015
Class of Stock [Line Items] |  |  |  |  |  |
Proceeds from sale of common stock in the Offering |  |  |  |  | $ 1,226,006 | $ 0
Goldman, Sachs & Co. |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |
Number of shares purchased in the Offering |  |  |  | 6,500,000 |  |
Share price (in dollars per share) |  |  |  | $ 58.50 |  |
Option to purchase common stock, period |  |  |  | 30 days |  |
Proceeds from sale of common stock in the Offering |  |  | $ 430,400 |  |  |
Goldman, Sachs & Co. | Maximum |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |
Option to purchase additional common stock (in shares) |  |  |  | 975,000 |  |
Credit Suisse Securities (USA) LLC and J.P. Morgan Securities LLC |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |
Number of shares purchased in the Offering |  | 10,500,000 |  |  |  |
Share price (in dollars per share) |  | $ 67.00 |  |  |  |
Option to purchase common stock, period |  | 30 days |  |  |  |
Proceeds from sale of common stock in the Offering | $ 795,600 |  |  |  |  |
Credit Suisse Securities (USA) LLC and J.P. Morgan Securities LLC | Maximum |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |
Option to purchase additional common stock (in shares) |  | 1,575,000 |  |  |  |

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