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Share repurchases (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands | 1 Months Ended | 3 Months Ended | 6 Months Ended
--- | --- | --- | ---
Aug. 16, 2019 | Jul. 17, 2019 | Jun. 30, 2019 | Jun. 30, 2019
Equity, Class of Treasury Stock [Line Items] |  |  |  |
Repurchase of common stock (in shares) |  |  | 2,060 | 2,060
Value of treasury stock acquired |  |  | $ 112,189 | $ 112,189
Average cost of treasury stock (usd per share) |  |  | $ 54.46 | $ 54.46
Subsequent Event |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |
Repurchase of common stock (in shares) |  | 4,214 |  |
Value of treasury stock acquired |  | $ 237,811 |  |
Average cost of treasury stock (usd per share) |  | $ 56.43 |  |
Prior shares under repurchase authorization (in shares) |  | 2,000,000 |  |
Minimum | Subsequent Event |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |
Tender Offer Treasury Stock Value To Be Acquired | $ 1,200,000 |  |  |
Tender Offer Treasury Stock Price Per Share | $ 53.50 |  |  |
Maximum | Subsequent Event |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |
Tender Offer Treasury Stock Price Per Share | $ 61.50 |  |  |
Forecast | Minimum |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |
Credit Agreement, Lender Commitment | $ 5,250,000 |  |  |

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