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Cash and stock-based compensation plans (Tables) | 12 Months Ended
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Dec. 31, 2012
Disclosure Of Compensation Related Costs, Share-Based Payments [Abstract] |
Schedule of Share-based Compensation, Restricted Stock and Restricted Stock Units Activity [Table Text Block] | A summary as of December 31, 2012 of the restricted stock granted to Directors during the years 2010, 2011 and 2012 is presented below:
|  | Shares |  |  | Weighted average grant date fair value |
Outstanding at January 1, 2010 |  |  | 62,938 |  |  | $ | 13.58 |
Granted |  |  | 38,115 |  |  |  | 12.46 |
Vested |  |  | (13,026 | ) |  |  | 13.80 |
Outstanding at December 31, 2010 |  |  | 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 |
Expected to vest |  |  | 90,829 |  |  | $ | 17.32
Schedule of Share-based Compensation, Restricted Stock Units Award Activity [Table Text Block] | A summary as of December 31, 2012, 2011 and 2010 of the status of the restricted stock units granted to certain Executives and changes during the years 2010, 2011 and 2012 are presented below:
|  | Stock units |  |  | Weighted average grant date fair value |  |  | Weighted average remaining contractual term |  |  | Aggregate intrinsic value (thousands) |
Outstanding at January 1, 2010 |  |  | 166,118 |  |  | $ | 10.20 |  |  |  |  |  |  |  |  |
Granted |  |  | 101,496 |  |  |  | 12.04 |  |  |  |  |  |  |  |  |
Forfeited |  |  | - |  |  |  | - |  |  |  |  |  |  |  |  |
Vested |  |  | (44,904 | ) |  |  | 10.59 |  |  |  |  |  |  |  |  |
Outstanding at December 31, 2010 |  |  | 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 |  |  |  |  |  |  | $ | 578 |
Outstanding at December 31, 2012 |  |  | 268,392 |  |  | $ | 15.93 |  |  |  | 2.11 years |  |  | $ | 1,510 |
Expected to vest |  |  | 268,392 |  |  | $ | 15.93 |  |  |  |  |  |  | $ | 1,510
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, 2011 and 2010 was estimated using a binomial option-pricing model for 2012 and 2011 and the “Black-Scholes” option-pricing model for 2010, based on the following factors:
|  | 2012 |  |  | 2011 |  |  | 2010 |
Weighted average fair value per option |  | $ | 3.01 |  |  | $ | 2.92 |  |  | $ | 2.91 |
Weighted average expected term, in years |  |  | 5.50 |  |  |  | 5.50 |  |  |  | 4.75 |
Expected volatility |  |  | 33.35 | % |  |  | 30 | % |  |  | 37 | %
Risk-free rate |  |  | 0.18% to 1.34% |  |  |  | 2.52 | % |  |  | 2.32 | %
Expected dividend |  |  | 5.30 | % |  |  | 4.50 | % |  |  | 5.00 | %
Schedule of Share-based Compensation, Stock Options, Activity [Table Text Block] | A summary of stock options granted is presented below:
|  | Options |  |  | Weighted average exercise price |  |  | Weighted average remaining contractual term |  |  | Aggregate intrinsic value (thousands) |
Outstanding at January 1, 2010 |  |  | 803,994 |  |  | $ | 11.58 |  |  |  |  |  |  |  |  |
Granted |  |  | 420,777 |  |  |  | 13.52 |  |  |  |  |  |  |  |  |
Forfeited |  |  | (646 | ) |  |  | 15.43 |  |  |  |  |  |  |  |  |
Exercised |  |  | (82,106 | ) |  |  | 10.15 |  |  |  |  |  |  |  |  |
Outstanding at December 31, 2010 |  |  | 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 |  |  |  | 4.15 years |  |  | $ | 3,273 |
Exercisable |  |  | 92,316 |  |  | $ | 12.45 |  |  |  | 2.12 years |  |  | $ | 841 |
Expected to vest |  |  | 331,356 |  |  | $ | 14.22 |  |  |  | 4.43 years |  |  | $ | 2,432
Schedule Of Share-Based Compensation, Restricted Stock Granted To Directors [Table Text Block] | A summary as of December 31, 2012 of restricted stock granted to Directors under this plan and changes during 2010, 2011 and 2012 is presented below:
|  | Shares |  |  | Weighted average grant date fair value |
Non vested at January 1, 2010 |  |  | 14,673 |  |  | $ | 20.45 |
Granted |  |  | - |  |  |  | - |
Vested |  |  | (5,756 | ) |  |  | 19.95 |
Non vested at December 31, 2010 |  |  | 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 |  |  | - |  |  | $ | - |
Expected to vest |  |  | - |  |  | $ | -
Share Options Granted To Directors and Certain Executives and Changes [Table Text Block] | A summary as of December 31, 2012 of the share options granted to Directors and certain Executives and changes during 2010, 2011 and 2012 is presented below:
|  | Options |  |  | Weighted average exercise price |  |  | Weighted average remaining contractual term |  |  | Aggregate intrinsic value (thousands) |
Outstanding at January 1, 2010 |  |  | 207,706 |  |  | $ | 16.34 |  |  |  |  |  |  |  |  |
Forfeited |  |  | - |  |  |  | - |  |  |  |  |  |  |  |  |
Outstanding at December 31, 2010 |  |  | 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 |  |  |  | 1.12 years |  |  | $ | 260 |
Exercisable at December 31, 2012 |  |  | 49,804 |  |  | $ | 16.34 |  |  |  | 1.12 years |  |  | $ | 260
Schedule of Share-based Compensation, Employee Stock Purchase Plan, Activity [Table Text Block] | A summary as of December 31, 2012 and changes during the years 2010, 2011 and 2012 of the indexed stock purchase options is presented below:
|  | Options |  |  | Weighted average exercise price |  |  | Weighted average remaining contractual term |  |  | Aggregate intrinsic value (thousands) |
Outstanding at January 1, 2010 |  |  | 385,469 |  |  | $ | 17.46 |  |  |  |  |  |  |  |  |
Forfeited |  |  | - |  |  |  | - |  |  |  |  |  |  |  |  |
Exercised |  |  | - |  |  |  | - |  |  |  |  |  |  |  |  |
Outstanding at December 31, 2010 |  |  | 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 |  |  | - |  |  | $ | - |  |  |  | - |  |  | $ | - |
Exercisable at December 31, 2012 |  |  | - |  |  | $ | - |  |  |  | - |  |  | $ | - |
Stock Options Granted To Employee and Changes [Table Text Block] | A summary of the status as of December 31, 2011 of the stock options granted and changes during 2010 and 2011 of these option plans is presented below:
|  | Options |  |  | Weighted average exercise price |  |  | Weighted average remaining contractual term |  |  | Aggregate intrinsic value (thousands) |
Outstanding at January 1, 2010 |  |  | 11,735 |  |  |  | 29.89 |  |  |  |  |  |  |  |  |
Forfeited |  |  | - |  |  |  | - |  |  |  |  |  |  |  |  |
Expired |  |  | (3,615 | ) |  |  | 23.16 |  |  |  |  |  |  |  |  |
Outstanding at December 31, 2010 |  |  | 8,120 |  |  |  | 32.88 |  |  |  |  |  |  |  |  |
Forfeited |  |  | - |  |  |  | - |  |  |  |  |  |  |  |  |
Expired |  |  | (8,120 | ) |  |  | 32.88 |  |  |  |  |  |  |  |  |
Outstanding at December 31, 2011 |  |  | - |  |  | $ | - |  |  |  | - |  |  | $ | - |
Schedule Of Deferred Compensation Plan [Table Text Block] | A summary on changes is presented below:
|  | 2012 |  |  | 2011 |  |  | 2010 |
Outstanding at beginning of year |  |  | 1,812 |  |  |  | 17,746 |  |  |  | 18,755 |
Exercised |  |  | (1,278 | ) |  |  | (15,934 | ) |  |  | (1,009 | )
Outstanding at end of year |  |  | 534 |  |  |  | 1,812 |  |  |  | 17,746 |

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