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Cash and stock-based compensation plans (Tables) | 12 Months Ended
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Dec. 31, 2013
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 |  |
| 2013 |  | 35% in the first and second year, 30% in the third year
| 2012 |  | 25% each year
| 2011 |  | 20% 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, 2011 |  | 88,027 |  | $ | 13.07 |
Granted |  | 25,541 |  |  | 18.07 |
Vested |  | (31,563) |  |  | 13.14 |
Outstanding at December 31, 2011 |  | 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 |
Expected to vest |  | 84,862 |  | $ | 20.10 |
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, 2011 |  | 222,710 |  | $ | 10.96 |  |  |  |  |  |
Granted |  | 94,496 |  |  | 15.84 |  |  |  |  |  |
Forfeited |  | (20,931) |  |  | 12.63 |  |  |  |  |  |
Vested |  | (69,865) |  |  | 11.09 |  |  |  |  |  |
Outstanding at December 31, 2011 |  | 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 |  |  |  | $ | 1,067 |
Outstanding at December 31, 2013 |  | 242,749 |  | $ | 17.13 |  | 2.30 years |  | $ | 2,643 |
Expected to vest |  | 242,749 |  | $ | 17.13 |  |  |  | $ | 2,643 |
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 2012 and 2011 was estimated using a binomial option-pricing model, based on the following factors:
|  | 2013 |  |  | 2012 |  |  |  | 2011 |
Weighted average fair value per option |  | - |  | $ | 3.01 |  |  | $ | 2.92 |
Weighted average expected term, in years |  | - |  |  | 5.50 |  |  |  | 5.50 |
Expected volatility |  | - |  |  | 33.35 | % |  |  | 30 | %
Risk-free rate |  | - |  |  | 0.18% a 1.34 | % |  |  | 2.52 | %
Expected dividend |  | - |  |  | 5.30 | % |  |  | 4.50 | %
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, 2011 |  | 1,142,019 |  | $ | 12.39 |  |  |  |  |  |
Granted |  | 72,053 |  |  | 17.81 |  |  |  |  |  |
Forfeited |  | (58,067) |  |  | 12.16 |  |  |  |  |  |
Exercised |  | (240,439) |  |  | 12.27 |  |  |  |  |  |
Outstanding at December 31, 2011 |  | 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 |  | 3.65 years |  | $ | 2,464 |
Exercisable |  | 53,994 |  | $ | 11.58 |  | 1.12 years |  | $ | 888 |
Expected to vest |  | 133,751 |  | $ | 16.24 |  | 4.09 years |  | $ | 1,576 |
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, 2011 |  | 8,917 |  | $ | 20.77 |
Granted |  | - |  |  | - |
Vested |  | (5,399) |  |  | 20.39 |
Non vested at December 31, 2011 |  | 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 |  |  |  |
|  |  |  |  |  |  | average |  |  |  |
|  |  |  |  |  |  | remaining |  |  | Aggregate |
|  |  |  |  | Weighted average |  | contractual |  |  | intrinsic value |
|  | Options |  |  | exercise price |  | term |  |  | (thousands) |
Outstanding at January 1, 2011 |  | 207,706 |  | $ | 16.34 |  |  |  |  |  |
Forfeited |  | - |  |  | - |  |  |  |  |  |
Exercised |  | (27,552) |  |  | 16.34 |  |  |  |  |  |
Outstanding at December 31, 2011 |  | 180,154 |  |  | 16.34 |  |  |  |  |  |
Forfeited |  | - |  |  | - |  |  |  |  |  |
Exercised |  | (130,350) |  |  | 16.34 |  |  |  |  |  |
Outstanding at December 31, 2012 |  | 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 |  |  |  |
|  |  |  |  |  |  | average |  |  |  |
|  |  |  |  |  |  | remaining |  | Aggregate |
|  |  |  | Weighted average |  | contractual |  | intrinsic value |
|  | Options |  | exercise price |  | term |  | (thousands) |
Outstanding at January 1, 2011 |  | 385,469 |  | $ | 17.98 |  |  |  |  |  |
Forfeited |  | - |  |  | - |  |  |  |  |  |
Expired |  | (4,100) |  |  | 11.87 |  |  |  |  |  |
Exercised |  | (55,433) |  |  | 12.12 |  |  |  |  |  |
Outstanding at December 31, 2011 |  | 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 |  | 2011 |
Outstanding at beginning of year |  | 534 |  | 1,812 |  | 17,746 |
Exercised |  | (534) |  | (1,278) |  | (15,934) |
Outstanding at end of year |  | - |  | 534 |  | 1,812 |

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