Stock-Based Compensation (Tables)

3 Months Ended

Mar. 31, 2013

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

Schedule of Shares Available for Future Grants

The following table summarizes the number of shares available for future grants under our 2011 Plan:

	As of March 31
(000)	2013
Shares available for future grants	4,741

Schedule of Stock-Based Compensation Expense

The following table summarizes our stock-based compensation expense and the related income tax benefit we recorded in the three months ended March 31, 2013 and March 31, 2012:

	Three months ended March 31
($000)	2013		2012
Restricted stock units	$	3,563	$	3,278
Restricted stock	97		444
Stock options	123		144
Total stock-based compensation expense	$	3,783	$	3,866
Income tax benefit related to the stock-based compensation expense	$	1,030	$	930

Schedule of Unrecognized Stock-Based Compensation Expense

The following table summarizes the amount of unrecognized stock-based compensation expense as of March 31, 2013 and the expected number of months over which the expense will be recognized:

	Unrecognized stock-based compensation expense ($000)		Expected amortization period (months)
Restricted stock units	$	26,014	31
Restricted stock	808		25
Stock options	955		25
Total unrecognized stock-based compensation expense	$	27,777	30

Schedule of Restricted Stock Units Award Activity

The following table summarizes restricted stock unit activity during the first three months of 2013:

Restricted Stock Units (RSUs)	Unvested		Vested but Deferred	Total		Weighted Average Grant Date Value per RSU
RSUs outstanding—December 31, 2012	727,145		18,782	745,927		$	53.37
Granted	—		—	—		—
Dividend equivalents	—		—	—		—
Vested	(2,586	)	—	(2,586	)	35.83
Vested but deferred	—		—	—		—
Issued	—		—	—		—
Forfeited	(9,500	)	—	(9,500	)	53.25
RSUs outstanding—March 31, 2013	715,059		18,782	733,841		53.87

Schedule of Stock Options, Valuation Assumptions

The weighted average fair value of options granted during 2011 was $23.81 per share, based on the following assumptions:

Assumptions for Black-Scholes Option Pricing Model
Expected life (years):	7.4
Volatility factor:	35.10	%
Dividend yield:	0.35	%
Interest rate:	2.87	%

Schedule of Options Granted at Exercise Price Below Fair Value per Share on Grant Date

The first table includes activity for options granted at an exercise price below the fair value per share of our common stock on the grant date; the second table includes activity for all other option grants. 

Options Granted At an Exercise Price Below the Fair Value Per Share on the Grant Date	Underlying Shares		Weighted Average Exercise Price
Options outstanding—December 31, 2012	282,695		$	20.55
Granted	—		—
Canceled	—		—
Exercised	(21,410	)	20.74
Options outstanding—March 31, 2013	261,285		20.78
Options exercisable—March 31, 2013	261,285		$	20.78

Schedule of All Other Option Granted

All Other Option Grants, Excluding Activity Shown Above	Underlying Shares		Weighted Average Exercise Price
Options outstanding—December 31, 2012	391,784		$	28.98
Granted	—		—
Canceled	(525	)	17.73
Exercised	(88,672	)	17.11
Options outstanding—March 31, 2013	302,587		32.69
Options exercisable—March 31, 2013	248,487		$	27.29

Schedule of Intrinsic Value of Stock Options Exercised During Period

The following table summarizes the total intrinsic value (difference between the market value of our stock on the date of exercise and the exercise price of the option) of options exercised:

	Three months ended March 31
($000)	2013		2012
Intrinsic value of options exercised	$	5,588	$	10,905

Schedule of Options, Vested and Expected to Vest, Outstanding and Exercisable

The table below shows additional information for options outstanding and exercisable as of March 31, 2013:

	Options Outstanding						Options Exercisable
Range of Exercise Prices	Number of  Options	Weighted Average Remaining Contractual Life (years)	Weighted Average Exercise Price		Aggregate Intrinsic Value ($000)		Exercisable Shares	Weighted Average Remaining Contractual Life (years)	Weighted Average Exercise Price		Aggregate Intrinsic Value ($000)
$8.57 - $14.70	29,582	0.11	$	8.63	$	1,813	29,582	0.11	$	8.63	$	1,813
$20.74- $47.32	462,615	1.90	23.66		21,400		462,615	1.90	23.66		21,400
$57.28 - $59.35	71,675	8.29	57.46		893		17,575	8.29	57.46		203
$8.57 - $59.35	563,872	4.29	27.17		$	24,106	509,772	2.02	23.95		$	23,416
Vested or Expected to Vest
$8.57 - $59.35	563,872	2.62	$	27.17	$	24,106

Schedule of Tax Benefits Related to Share Based Compensation

The following table summarizes our excess tax benefits for the three months ended March 31, 2013 and March 31, 2012:

	Three months ended March 31
($000)	2013		2012
Excess tax benefits related to stock-based compensation	$	1,587	$	3,313