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Stock-based compensation (Tables) | 9 Months Ended
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Sep. 30, 2018
Executive Officers |
Schedule of Unvested Restricted Stock Units Roll Forward [Table Text Block] |
(Not in thousands) | Shares |  | Weighted-Average Grant Date Fair Value
Non-vested at December 31, 2016 | 383,982 | $ | 26.35
Granted | 212,200 |  | 42.57
Performance Shares Quantity Adjustment | (232,989) |  | 29.10
Vested | (67,853) |  | 48.54
Non-vested at December 31, 2017 | 295,340 | $ | 30.75
Granted | 236,115 |  | 45.69
Performance Shares Quantity Adjustment | 182,813 |  | 30.58
Vested | (293,707) |  | 34.40
Forfeited | (6,652) |  | 33.14
Non-vested at September 30, 2018 | 413,909 | $ | 36.57
Directors |
Schedule of Unvested Restricted Stock Units Roll Forward [Table Text Block] |
(Not in thousands) | Restricted Stock |  | Weighted-Average Grant Date Fair Value
Non-vested at December 31, 2016 | - | $ | -
Granted | 25,771 |  | 38.42
Vested | (25,771) |  | 38.42
Forfeited | - |  | -
Non-vested at December 31, 2017 | - | $ | -
Granted | 25,159 |  | 46.71
Vested | (25,159) |  | 46.71
Forfeited | - |  | -
Non-vested at September 30, 2018 | - | $ | -

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- Definition Tabular disclosure of the change in restricted stock units (RSUs). + References No definition available. + Details
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