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Share repurchases (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands | 9 Months Ended |  |  |
--- | --- | --- | --- | ---
Sep. 30, 2018 | Nov. 05, 2018 | Jul. 11, 2018 | Oct. 10, 2017
Equity, Class of Treasury Stock [Line Items] |  |  |  |
Repurchase of common stock (in shares) | 16,844 |  |  |
Value of treasury stock acquired | $ 1,153,511 |  |  |
Average cost of treasury stock (usd per share) | $ 68.48 |  |  |
Stock repurchase additional authorization amount |  |  | $ 1,389,999 |
Prior shares under repurchase authorization (in shares) |  |  |  | 110,001
Subsequent Event |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |
Remaining repurchase authorized amount |  | $ 1,355,605 |  |

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