Stock Option Plans, Stock Grants, Stock Appreciation Rights and Employee Stock Purchase Plan (Tables)

12 Months Ended

Dec. 31, 2012

Amounts Charged to Expense for Stock-based Compensation

The amounts charged to expense for stock-based compensation for the years ended December 31, 2012, 2011 and 2010 are presented in the following table:

	Year Ended December 31,
In thousands	2012		2011			2010
Restricted stock units(1)	$	7,380	$	139		$	5,551
Directors restricted stock grants(2)		390		248			210
Employee stock purchase plan		82		173			221
Stock appreciation rights(3)		—		(100	)		(77	)
Stock options		—		—			—
Total stock based compensation	$	7,852	$	460		$	5,905

(1) — The increase in RSU expense for 2012 as compared to 2011 is largely impacted by a $6.2 million reversal of RSU expense recorded in 2011 related to performance based awards that are not expected to vest, and to a lesser extent, the issuance of additional performance and non-performance RSU granted in 2012, partially offset by the impact of cancellations. The decrease in RSU expense for 2011 as compared to 2010 was primarily due to the reduction in RSU expense related to performance based awards not expected to vest.

(2) — Relates to non-employee directors serving on the Parent Company’s Board of Directors, all of whom have been elected by the Company’s stockholders, as well as non-employee directors serving on NUAL’s Board of Directors.

(3) — All outstanding stock appreciation rights were exercised during 2011. The Company has no current plans to issue stock appreciation rights under the 2005 Amended and Restated Stock Incentive Plan.

Unvested Restricted Stock Grants Outstanding

Unvested restricted stock units outstanding as of December 31, 2012, 2011 and 2010, and changes during the years ended on those dates, are presented in the following table:

	December 31,
	2012			2011			2010
Beginning balance		526,972			590,661			619,739
Granted—Performance		97,145			86,118			90,634
Granted—Non Performance		146,915			98,640			78,500
Total Granted		244,060			184,758			169,134
Vested—Performance Earned		—			(22,993	)		(8,333	)
Vested—Performance Unearned		(46,998	)		(42,334	)		(12,000	)
Vested—Non Performance		(91,323	)		(149,738	)		(148,390	)
Total Vested		(138,321	)		(215,065	)		(168,723	)
Forfeited		(45,082	)		(33,382	)		(29,489	)
Ending balance		587,629			526,972			590,661

Stock Options Outstanding

Stock options outstanding as of December 31, 2012, 2011 and 2010 are as follows:

	December 31,
	2012					2011					2010
				Average					Average					Average
	# of Shares			Exercise Price		# of Shares			Exercise Price		# of Shares			Exercise Price
Beginning balance		105,250		$	29.50		157,500		$	27.13		191,000		$	26.21
Granted		—			—		—			—		—			—
Exercised		(15,000	)	$	26.90		(52,250	)	$	22.35		(29,000	)	$	21.12
Expired or forfeited		—			—		—			—		(4,500	)	$	26.69
Ending balance		90,250		$	29.94		105,250		$	29.50		157,500		$	27.13
Number of options exercisable		90,250		$	29.94		105,250		$	29.50		157,500		$	27.13

Summarized Information about Options Outstanding

The following table summarizes information about stock options outstanding as of December 31, 2012:

			Average
	Outstanding		Remaining		Average		Average Aggregate		Exercisable		Average		Average Aggregate
Price Range	Options		Contract Life		Exercise Price		Intrinsic Value		Options		Exercise Price		Intrinsic Value
$21 to $30		68,750		1.1	$	28.86	$	22.21		68,750	$	28.86	$	22.21
$31 to $37		21,500		2.2	$	33.39	$	17.68		21,500	$	33.39	$	17.68
Total		90,250								90,250

SARs Outstanding

SARs outstanding as of December 31, 2012, 2011 and 2010 were as follows:

	December 31,
	2012				2011					2010
	SARs		Average Exercise Prices		SARs			Average Exercise Prices		SARs			Average Exercise Prices
Beginning balance		—	$	—		16,500		$	18.74		52,000		$	14.05
Granted		—		—		—			—		—			—
Exercised		—		—		(16,500	)	$	18.74		(35,500	)	$	11.86
Expired or forfeited		—		—		—			—		—			—
Ending balance		—	$	—		—		$	—		16,500		$	18.74
Number of SARs exercisable		—	$	—		—		$	—		16,500		$	18.74