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v3.19.1

Shareholders' equity (Narrative) (Details) $ / shares in Units, $ in Thousands |  | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Mar. 20, 2018 USD ($) installment $ / shares | Dec. 31, 2018 USD ($) vote $ / shares shares | Dec. 31, 2017 USD ($) $ / shares shares | Dec. 31, 2016 USD ($) shares | Oct. 05, 2018 $ / shares | May 22, 2018 USD ($) $ / shares | Apr. 05, 2018 $ / shares | Dec. 31, 2015 $ / shares shares
Class of Stock [Line Items] |  |  |  |  |  |  |  |
Common stock, shares authorized |  | 500,000,000 |  |  |  |  |  |
Common stock, shares issued |  | 211,593,073 | 211,072,508 | 210,711,224 |  |  |  | 210,538,896
Common stock, shares outstanding |  |  |  |  |  |  |  | 210,538,896
Common stock dividends declared | $ | $ 20,937 | $ 20,937 | $ 0 | $ 0 |  |  |  |
Salary period paid upon employee leaving |  | 30 days |  |  |  |  |  |
Class A |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |
Common stock, shares authorized |  | 420,000,000 |  |  |  |  |  |
Common stock, par value (in dollars per share) | $ / shares |  | $ 0 |  |  |  |  |  | $ 0
Common stock, shares issued |  | 131,593,073 | 131,072,508 | 130,711,224 |  |  |  | 130,538,896
Common stock, shares outstanding |  |  |  |  |  |  |  | 130,538,896
Shares issued during the period |  | 520,565 | 361,284 | 172,328 |  |  |  |
Number of votes per share (in votes) | vote |  | 1 |  |  |  |  |  |
Common stock, dividends, number of payment installments | installment | 2 |  |  |  |  |  |  |
Dividends payable (in dollars per share) | $ / shares | $ 0.10 |  |  |  | $ 0.05 |  | $ 0.05 |
Class B |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |
Common stock, shares authorized |  | 80,000,000 |  |  |  |  |  |
Common stock, par value (in dollars per share) | $ / shares |  | $ 0 | $ 0 |  |  |  |  |
Common stock, shares issued |  | 80,000,000 | 80,000,000 | 80,000,000 |  |  |  | 80,000,000
Common stock, shares outstanding |  |  |  |  |  |  |  | 80,000,000
Number of votes per share (in votes) | vote |  | 5 |  |  |  |  |  |
Common stock, dividends, number of payment installments | installment | 2 |  |  |  |  |  |  |
Dividends payable (in dollars per share) | $ / shares | $ 0.10 |  |  |  | $ 0.05 |  | $ 0.05 |
The Repurchase Program |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |
Number of shares repurchased (in shares) |  | 6,360,826 |  |  |  |  |  |
Value of shares repurchased | $ |  | $ 46,035 |  |  |  |  |  |
The Repurchase Program | Class A |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |
Common stock, par value (in dollars per share) | $ / shares |  |  |  |  |  | $ 0 |  |
Shares authorized | $ |  |  |  |  |  | $ 60,000 |  |

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