Stock Compensation Plans (Tables)

12 Months Ended

Dec. 31, 2013

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

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, 2013, 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, 2013	473		$	19.10
Options exercised	(300	)	20.90
Options & SOSARs cancelled / forfeited	—		—
Options and SOSARs outstanding at December 31, 2013	173		$	15.99	0.76	$	7,510
Vested and expected to vest at December 31, 2013	173		$	15.99	0.76	$	7,510
Options exercisable at December 31, 2013	173		$	15.99	0.76	$	7,510

	Year ended December 31,
(in thousands)	2013		2012		2011
Total intrinsic value of options exercised	$	4,678	$	1,937	$	3,817
Total fair value of shares vested	$	576	$	818	$	816
Weighted average fair value of options granted	$	—	$	—	$	—

Summary of nonvested restricted shares

A summary of the status of the Company's nonvested restricted shares as of December 31, 2013, 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, 2013	180		$	28.82
Granted	60		47.65
Vested	(50	)	25.27
Forfeited	(2	)	29.93
Nonvested restricted shares at December 31, 2013	188		$	35.74

	Year ended December 31,
	2013	2012	2011
Total fair value of shares vested (000's)	$1,121	$590	$1,367
Weighted average fair value of restricted shares granted	$47.65	$28.99	$31.87

Summary of nonvested performance share units

A summary of the status of the Company's PSUs as of December 31, 2013, and changes during the period then ended, is presented below:

	Shares (000)'s		Weighted-Average Grant-Date Fair Value
Nonvested at January 1, 2013	306		$	28.81
Granted	104		47.32
Vested	(54	)	22.09
Forfeited	(6	)	32.56
Nonvested at December 31, 2013	350		$	35.27

	Year ended December 31,
	2013	2012	2011
Weighted average fair value of PSUs granted	$47.32	$28.99	$31.87

Fair value of the option component of the ESP Plan

	2013		2012		2011
Risk free interest rate	0.16	%	0.11	%	0.27	%
Dividend yield	1.49	%	1.37	%	1.21	%
Volatility factor of the expected market price of the common shares	0.27		0.41		0.34
Expected life for the options (in years)	1.00		1.00		1.00