Share-Based Compensation Plans (Tables)

12 Months Ended

Dec. 31, 2011

Share-Based Compensation Plans

Share-based compensation expense

	Years Ended December 31,
	2011	2010	2009
	(Thousands)
2008 Executive Performance Incentive Program	923	316	770
2010 Executive Performance Incentive Programs	2,118	2,905	–
2009 Shareholder Value Plan	–	–	45,097
2007 Supply Long-Term Incentive Program	198	6,763	8,652
2010 Stock Incentive Award Program	4,241	4,134	–
2011 Value Driver Award Program	15,807	–	–
2011 Volume and Efficiency Program	5,384	–	–
Restricted stock awards	2,281	3,020	3,634
Non-qualified stock options	6,057	4,045	3,134
Non-employee directors’ share-based awards	3,320	1,196	557
Total share-based compensation expense	40,329	$   22,379	$   61,844

Summary of restricted stock awards activity during the period

Restricted Stock	Non- Vested Shares		Weighted Average Fair Value		Aggregate Fair Value
Outstanding at January 1, 2011	231,900		$	45.22	$	10,486,005
Granted	65,390		$	51.50	3,367,478
Vested	(93,070	)	$	54.78	(5,098,498		)
Forfeited	(23,270	)	$	41.12	(956,791		)
Outstanding at December 31, 2011	180,950		$	43.10	$	7,798,194

Non-Qualified Stock Options, assumptions used to value share-based compensation

	Years Ended December 31,
	2011	2010	2009
Risk-free interest rate	2.02%	1.60% - 2.50%	N/A
Dividend yield	2.19%	2.10% - 2.34%	N/A
Volatility factor	.29	.28	N/A
Expected term	5 years	5 years	N/A

Summary of option activity

Non-qualified Stock Options	Shares	Weighted Average Exercise Price		Weighted Average Remaining Contractual Term	Aggregate Intrinsic Value
Outstanding at January 1, 2011	2,282,276	$	34.31
Granted	229,100	$	44.84
Exercised	(561,655)	$	17.05
Forfeited	(2,934)	$	49.17
Outstanding at December 31, 2011	1,946,787	$	40.51	5.3 years	$ 28,154,700
Exercisable at December 31, 2011	1,710,762	$	40.10	2.9 years	$ 25,445,034