Share-Based Payments (Tables)

12 Months Ended

Dec. 31, 2015

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Compensation Costs Related To Share-Based Payments

Year ended December 31,		2015		2014		2013
Stock option compensation expense	$	4,001	$	3,710	$	4,504
Share unit expense		5,673		5,864		2,460
Employee share purchase plan -
employer contributions		1,332		1,272		1,302
	$	11,006	$	10,846	$	8,266

Summary Of Stock Option Activity

					Weighted
				Weighted	average
	Common			average	remaining			Aggregate
	shares under			exercise	contractual			intrinsic
	option	price			life (in years)	value
Outstanding, December 31, 2012	3,540,497		$	20.27
Granted	884,500			21.34
Exercised	(427,972)			14.37			$	2,894
Forfeited	(236,351)			21.88
Expired	(11,100)			23.58
Outstanding, December 31, 2013	3,749,574			21.09
Granted	837,364			23.60
Exercised	(663,152)			18.28			$	4,304
Forfeited	(25,995)			23.26
Outstanding, December 31, 2014	3,897,791			22.09
Granted	880,706			25.50
Exercised	(1,412,535)			21.11			$	9,426
Forfeited	(89,884)			23.10
Outstanding, December 31, 2015	3,276,078		$	23.40	6.9		$	4,246
Exercisable, December 31, 2015	1,800,512		$	22.46	5.4		$	3,601

Summary Of Share Unit Activity

	Performance share units			Restricted share units			Deferred share units
			WA grant			WA grant			WA grant
			date fair			date fair			date fair
	Number		value	Number		value	Number		value
Outstanding, December 31, 2012	-	$	-	-	$	-	-	$	-
Granted	78,831		21.99	278,771		21.78	19,624		21.99
Forfeited	(2,604)		22.01	(6,847)		22.01	-		-
Outstanding, December 31, 2013	76,227		21.99	271,924		21.78	19,624		21.99
Granted	186,554		23.82	237,645		22.86	22,665		22.66
Vested and settled	(3,702)		22.22	(65,293)		22.01	-		-
Forfeited	(20,506)		22.38	(40,689)		22.32	-		-
Outstanding, December 31, 2014	238,573		23.38	403,587		22.32	42,289		22.33
Granted	218,699		24.57	20,528		26.38	29,072		26.07
Vested and settled	(6,870)		22.22	(28,887)		22.53	(13,365)		22.34
Forfeited	(28,817)		23.23	(62,274)		21.56	-		-
Outstanding, December 31, 2015	421,585	$	24.03	332,954	$	22.70	57,996	$	24.21

Stock Option Plan [Member]

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Summary Of Stock Option And Performance Share Unit Pricing Assumptions

	2015	2014	2013
Risk free interest rate	1.8%	1.8%	0.9%
Expected dividend yield	2.18%	2.31%	2.31%
Expected lives of the stock options	5 years	5 years	5 years
Expected volatility	26.4%	29.3%	35.2%

Performance Share Unit Plans [Member]

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Summary Of Stock Option And Performance Share Unit Pricing Assumptions

	2015
Risk free interest rate	1.3%
Expected dividend yield	2.17%
Expected lives of the PSUs	3 years
Expected volatility	29.4%
Average expected volatility of comparable companies	32.8%