Stock Compensation Plans (Tables)

12 Months Ended

Dec. 31, 2012

Disclosure of Compensation Related Costs, Share-based Payments [Abstract]

Weighted-average fair values and assumptions for options granted

	2012		2011		2010
Risk free interest rate	—	%	—	%	1.96	%
Dividend yield	—	%	—	%	1.10	%
Volatility factor of the expected market price of the Company's common shares	—		—		0.56
Expected life for the options (in years)	—		—		4.10

Summary of stock options outstanding and exercisable under long-term performance compensation plan

A reconciliation of the number of SOSARs outstanding and exercisable under the Long-Term Performance Compensation Plan as of December 31, 2012, and changes during the period then ended is as follows:

	Shares (000's)		Weighted- Average Exercise Price		Weighted- Average Remaining Contractual Term	Aggregate Intrinsic Value (000's)
Options & SOSARs outstanding at January 1, 2012	503		$	31.56
SOSARs granted	—		—
Options exercised	(188	)	36.45
Options & SOSARs cancelled / forfeited	—		—
Options and SOSARs outstanding at December 31, 2012	315		$	28.65	1.24	$	4,789
Vested and expected to vest at December 31, 2012	315		$	28.65	1.23	$	4,785
Options exercisable at December 31, 2012	275		$	28.06	1.10	$	4,384

	Year ended December 31,
(in thousands)	2012		2011		2010
Total intrinsic value of options exercised	$	1,937	$	3,817	$	2,724
Total fair value of shares vested	$	818	$	816	$	3,084
Weighted average fair value of options granted	$	—	$	—	$	13.75

Summary of nonvested restricted shares

A summary of the status of the Company's nonvested restricted shares as of December 31, 2012, and changes during the period then ended, is presented below:

	Shares (000)'s		Weighted-Average Grant-Date Fair Value
Nonvested restricted shares at January 1, 2012	93		$	33.54
Granted	69		43.49
Vested	(40	)	21.61
Forfeited	(2	)	41.80
Nonvested restricted shares at December 31, 2012	120		$	43.23

	Year ended December 31,
	2012	2011	2010
Total fair value of shares vested (000's)	$590	$1,367	$566
Weighted average fair value of restricted shares granted	$43.49	$47.80	$32.75

Summary of nonvested performance share units

A summary of the status of the Company's PSUs as of December 31, 2012, and changes during the period then ended, is presented below:

	Shares (000)'s		Weighted-Average Grant-Date Fair Value
Nonvested at January 1, 2012	165		$	32.73
Granted	97		43.49
Vested	(22	)	11.97
Forfeited	(36	)	14.95
Nonvested at December 31, 2012	204		$	43.21

	Year ended December 31,
	2012	2011	2010
Weighted average fair value of PSUs granted	$43.49	$47.80	$32.69

Fair value of the option component of the ESP Plan

	2012		2011		2010
Risk free interest rate	0.11	%	0.27	%	0.47	%
Dividend yield	1.37	%	1.21	%	1.1	%
Volatility factor of the expected market price of the common shares	0.41		0.34		0.54
Expected life for the options (in years)	1.00		1.00		1.00