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Cash and stock-based compensation plans (Details 3) - Stock options [Member] | 12 Months Ended
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Dec. 31, 2017 USD ($) NumberofShare $ / shares shares | Dec. 31, 2016 USD ($) NumberofShare | Dec. 31, 2015 USD ($) NumberofShare
Disclosure Of Sharebased Payment Arrangements [Line Items] |  |  |
Number of Share Options Outstanding at Beginning | NumberofShare | 485,845 | 554,756 | 391,696
Number of share options Granted | NumberofShare | 0 | 0 | 233,418
Number of share options Forfeited | NumberofShare | (69,934) | (126) | 0
Number of share options Exercised | NumberofShare | (142,268) | (68,785) | (70,358)
Number of Share Options Outstanding at End | NumberofShare | 273,643 | 485,845 | 554,756
Number of share options Exercisable | NumberofShare | 121,840 |  |
Number of share options Expected to vest | shares | 151,803 |  |
Weighted average exercise price, Outstanding at Beginning | $ 26.87 | $ 26.36 | $ 23.65
Weighted average exercise price, Granted |  | 0 | 29.25
Weighted average exercise price, Forfeited | 28.63 | 18.93 | 0
Weighted average exercise price, Exercised | 24.84 | 22.78 | 20.86
Weighted average exercise price, Exercisable | 27.73 |  |
Weighted average exercise price, Outstanding at End | $ 27.48 | $ 26.87 | $ 26.36
Weighted average exercise price, Exercisable, Expected to vest | $ / shares | $ 27.28 |  |
Weighted Average Remaining Contractual Term of Outstanding | 3.66 years |  |
Weighted average remaining contractual term, Exercisable | 3.70 years |  |
Weighted average remaining contractual term, Expected to vest | 3.63 years |  |
Aggregate Intrinsic value, Outstanding at End | $ 242 |  |
Aggregate Intrinsic value, Exercisable | 115 |  |
Aggregate Intrinsic value, Expected to vest | $ 128 |  |

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