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Cash and stock-based compensation plans (Tables) | 12 Months Ended
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Dec. 31, 2014
Disclosure Of Compensation Related Costs, Share-Based Payments [Abstract] |
Disclosure of vesting of restricted stock [Table Text Block] | Restricted stock vest on the grant’s date anniversary, as follows:
Year of Grant |  |  |
2014 |  | 35% in the first and second year, and 30% in the third year |
2013 |  | 35% in the first and second year, and 30% in the third year |
2012 |  | 25% each year |
Schedule of Share-based Compensation, Restricted Stock and Restricted Stock Units Activity [Table Text Block] | A summary of the restricted stock granted to Directors is presented below:
|  |  |  |  | Weighted average |
|  |  |  |  | grant date fair |
|  | Shares |  | value |
Outstanding at January 1, 2012 |  |  | 82,005 |  | $ | 14.59 |
Granted |  |  | 32,317 |  |  | 22.09 |
Vested |  |  | (23,493) |  |  | 14.35 |
Outstanding at December 31, 2012 |  |  | 90,829 |  |  | 17.32 |
Granted |  |  | 28,500 |  |  | 25.00 |
Vested |  |  | (34,467) |  |  | 16.84 |
Outstanding at December 31, 2013 |  |  | 84,862 |  |  | 20.10 |
Granted |  |  | 28,500 |  |  | 30.25 |
Vested |  |  | (35,026) |  |  | 18.80 |
Outstanding at December 31, 2014 |  |  | 78,336 |  | $ | 24.37 |
Expected to vest |  |  | 78,336 |  | $ | 24.37 |
Schedule of Share-based Compensation, Restricted Stock Units Award Activity [Table Text Block] | A summary of the status of the restricted stock units granted to certain Executives is presented below:
|  |  |  |  |  |  | Weighted |  |  |  |
|  |  |  |  | Weighted |  | average |  |  |  |
|  |  |  |  | average grant |  | remaining |  | Aggregate |
|  |  |  |  | date fair |  | contractual |  | intrinsic value |
|  | Stock units |  | value |  | term |  | (thousands) |
Outstanding at January 1, 2012 |  |  | 226,410 |  | $ | 12.80 |  |  |  |  |  |
Granted |  |  | 181,598 |  |  | 17.52 |  |  |  |  |  |
Forfeited |  |  | (54,367) |  |  | 13.88 |  |  |  |  |  |
Vested |  |  | (85,249) |  |  | 12.31 |  |  |  |  |  |
Outstanding at December 31, 2012 |  |  | 268,392 |  |  | 15.93 |  |  |  |  |  |
Granted |  |  | 114,070 |  |  | 18.76 |  |  |  |  |  |
Forfeited |  |  | (15,223) |  |  | 16.81 |  |  |  |  |  |
Vested |  |  | (124,490) |  |  | 16.08 |  |  |  |  |  |
Outstanding at December 31, 2013 |  |  | 242,749 |  |  | 17.13 |  |  |  |  |  |
Granted |  |  | 47,737 |  |  | 19.24 |  |  |  |  |  |
Forfeited |  |  | (39,255) |  |  | 17.25 |  |  |  |  |  |
Vested |  |  | (87,519) |  |  | 16.27 |  |  |  | $ | 813 |
Outstanding at December 31, 2014 |  |  | 163,712 |  | $ | 18.18 |  | 2.04 years |  | $ | 1,952 |
Expected to vest |  |  | 163,712 |  | $ | 18.18 |  |  |  | $ | 1,952 |
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block] | The fair value of stock purchase options granted to certain Executives during 2014 and 2012 was estimated using a binomial option-pricing model, based on the following factors:
|  |  |  | Measuring |  |  |  |  |  |
|  |  |  | unit |  | 2014 |  | 2013 |  | 2012 |
Weighted average fair value per option |  |  |  |  | $ |  |  | 2.16 |  |  | - |  |  | 3.01 |
Weighted average expected term, in years |  |  |  |  | years |  |  | 5.50 |  |  | - |  |  | 5.50 |
Expected volatility |  |  |  |  | % |  |  | 22.74 |  |  | - |  |  | 33.35 |
Risk-free rate |  |  |  |  | % |  |  | 0.12 to 2.19 |  |  | - |  |  | 0.18 to 1.34 |
Expected dividend |  |  |  |  | % |  |  | 5.00 |  |  | - |  |  | 5.30 |
Schedule of Share-based Compensation, Stock Options, Activity [Table Text Block] | A summary of stock options granted is presented below:
|  |  |  |  | Weighted |  |  |
|  |  |  |  | average |  | Aggregate |
|  |  | Weighted |  | remaining |  | intrinsic |
|  |  | average |  | contractual |  | value |
|  | Options |  | exercise price |  | term |  | (thousands) |
Outstanding at January 1, 2012 |  |  | 915,566 |  | $ | 12.87 |  |  |  |  |  |
Granted |  |  | 182,420 |  |  | 18.93 |  |  |  |  |  |
Forfeited |  |  | (231,639) |  |  | 15.82 |  |  |  |  |  |
Exercised |  |  | (442,675) |  |  | 12.90 |  |  |  |  |  |
Outstanding at December 31, 2012 |  |  | 423,672 |  |  | 13.83 |  |  |  |  |  |
Granted |  |  | - |  |  | - |  |  |  |  |  |
Forfeited |  |  | (9,780) |  |  | 18.18 |  |  |  |  |  |
Exercised |  |  | (226,147) |  |  | 12.76 |  |  |  |  |  |
Outstanding at December 31, 2013 |  |  | 187,745 |  |  | 14.90 |  |  |  |  |  |
Granted |  |  | 315,971 |  |  | 25.15 |  |  |  |  |  |
Forfeited |  |  | (671) |  |  | 18.57 |  |  |  |  |  |
Exercised |  |  | (111,349) |  |  | 13.18 |  |  |  |  |  |
Outstanding at December 31, 2014 |  |  | 391,696 |  | $ | 23.65 |  | 5.62 years |  | $ | 2,526 |
Exercisable |  |  | 33,803 |  | $ | 15.53 |  | 2.11 years |  | $ | 493 |
Expected to vest |  |  | 357,893 |  | $ | 24.42 |  | 5.88 years |  | $ | 2,033 |
Schedule Of Share-Based Compensation, Restricted Stock Granted To Directors [Table Text Block] | A summary of restricted stock granted to Directors is presented below:
|  |  | Weighted average |
|  |  | grant date fair |
|  | Shares |  | value |
Non vested at January 1, 2012 |  |  | 3,518 |  | $ | 21.35 |
Granted |  |  | - |  |  | - |
Vested |  |  | (3,518) |  |  | 21.35 |
Non vested at December 31, 2012 |  |  | - |  |  |  |
Share Options Granted To Directors and Certain Executives and Changes [Table Text Block] | A summary of the share options granted to Directors and certain Executives is presented below:
|  |  |  |  |  |  |  | Weighted |  |  |
|  |  |  |  | Weighted |  | average |  | Aggregate |
|  |  |  |  | average |  | remaining |  | intrinsic |
|  |  |  |  | exercise |  | contractual |  | value |
|  | Options |  | price |  | term |  | (thousands) |
Outstanding at January 1, 2013 |  |  | 49,804 |  | $ | 16.34 |  |  |  |  |  |  |
Forfeited |  |  | - |  |  | - |  |  |  |  |  |  |
Exercised |  |  | (49,804) |  |  | 16.34 |  |  |  |  |  |  |
Outstanding at December 31, 2013 |  |  | - |  |  |  |  |  |  |  |  |  |
Schedule of Share-based Compensation, Employee Stock Purchase Plan, Activity [Table Text Block] | A summary of the indexed stock purchase options is presented below:
|  |  |  |  |  |  |  |  |  | Weighted |
|  |  |  |  | Weighted |  | Average |  | Aggregate |
|  |  |  |  | average |  | remaining |  | intrinsic |
|  |  |  |  | exercise |  | contractual |  | value |
|  | Options |  | price |  | term |  | (thousands) |
Outstanding at January 1, 2012 |  |  | 325,936 |  | $ | 12.86 |  |  |  |  |  |  |
Forfeited |  |  | - |  |  | - |  |  |  |  |  |  |
Expired |  |  | (3,542) |  |  | 14.48 |  |  |  |  |  |  |
Exercised |  |  | (322,394) |  |  | 16.41 |  |  |  |  |  |  |
Outstanding at December 31, 2012 |  |  | - |  |  |  |  |  |  |  |  |  |
Schedule Of Deferred Compensation Plan [Table Text Block] | A summary on changes is presented below:
|  | 2013 |  | 2012 |
Outstanding at beginning of year |  |  | 534 |  |  | 1,812 |
Exercised |  |  | (534) |  |  | (1,278) |
Outstanding at end of year |  |  | - |  |  | 534 |

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