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Cash and stock-based compensation plans (Tables)

12 Months Ended

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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