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Cash and stock-based compensation plans (Tables)

12 Months Ended

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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