Equity Award Plans (Tables)

12 Months Ended

Dec. 31, 2012

Equity Award Plans

Summary of activity related to stock options during the year

	Shares			Weighted Average Exercise Price		Weighted Average Remaining Contractual Term (in years)		Aggregate Intrinsic Value ($000)
Outstanding at December 31, 2011		495,324		$	43.13
Granted		87,192		$	62.88
Exercised		(26,163	)	$	6.11
Forfeited or expired		(14,984	)	$	97.71
Outstanding at December 31, 2012		541,369		$	46.58		5.3	$	3,808
Exercisable at December 31, 2012		418,879		$	38.09		4.3	$	3,811

Schedule of weighted average assumptions used to determine the grant-date fair value of options granted

	For the year ended December 31,
	2012			2011(1)			2010
Risk free interest rate		0.85	%		0.88	%		2.22	%
Dividend yield		0.55	%		0.52	%		0.75	%
Expected life (years)		4.95			2.46			5.10
Volatility		75.79	%		57.51	%		69.64	%

(1)

Includes fully vested replacement stock options issued on April 1, 2011 in connection with the acquisition of Western Coal described in Note 3, which significantly reduced the expected life as compared to prior periods.

Summary of activity related to nonvested restricted stock units during the year

	Shares			Aggregate Intrinsic Value ($000)		Weighted Average Remaining Contractual Term in Years
Outstanding at December 31, 2011		163,247
Granted		65,312
Vested		(43,888	)
Forfeited or expired		(35,400	)
Outstanding at December 31, 2012		149,271		$	5,356		1.11