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

12 Months Ended

Dec. 31, 2014

Amounts Charged to Expense for Stock-based Compensation

The amounts charged to expense for stock-based compensation for the years ended December 31, 2014, 2013 and 2012 are presented in the following table:

	Year Ended December 31,
In thousands	2014		2013		2012
Restricted stock units	$	11,507	$	3,369	$	7,380
Directors restricted stock grants (1)		420		413		390
Employee stock purchase plan		194		132		82
Total stock-based compensation	$	12,121	$	3,914	$	7,852

(1) - 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.

Unvested Restricted Stock Grants Outstanding

Unvested restricted stock units outstanding as of December 31, 2014, 2013 and 2012, and changes during the years ended on those dates, are presented in the following table:

	December 31,
	2014			2013			2012
Beginning balance		626,812			587,629			526,972
Granted - Performance		228,607			114,463			97,145
Granted - Non Performance		59,523			155,463			146,915
Total Granted		288,130			269,926			244,060
Vested - Performance Earned		—			(15,714	)		—
Vested - Performance Unearned		(93,453	)		(57,585	)		(46,998	)
Vested - Non Performance		(90,263	)		(60,183	)		(91,323	)
Total Vested		(183,716	)		(133,482	)		(138,321	)
Forfeited		(12,334	)		(97,261	)		(45,082	)
Ending balance		718,892			626,812			587,629

Stock Options Outstanding

Stock options outstanding as of December 31, 2014, 2013 and 2012 are as follows:

	December 31,
	2014					2013					2012
	# of Shares			Average Exercise Price		# of Shares			Average Exercise Price		# of Shares			Average Exercise Price
Beginning balance		6,750		$	30.65		90,250		$	29.94		105,250		$	29.50
Granted		—			—		—			—		—			—
Exercised		(5,250	)	$	29.11		(83,500	)	$	29.88		(15,000	)	$	26.90
Expired or forfeited		—			—		—			—		—		$	—
Ending balance		1,500		$	36.03		6,750		$	30.65		90,250		$	29.94
Number of options exercisable		1,500		$	36.03		6,750		$	30.65		90,250		$	29.94

Summarized Information about Options Outstanding

The following table summarizes information about stock options outstanding as of December 31, 2014:

Price Range	Outstanding Options		Average Remaining Contract Life		Average Exercise Price		Average Aggregate Intrinsic Value		Exercisable Options		Average Exercise Price		Average Aggregate Intrinsic Value
$31 to $37		1,500		0.7	$	36.03	$	27.13		1,500	$	36.03	$	27.13
Total		1,500		0.7						1,500