Employee Benefit Plans

3 Months Ended

Mar. 31, 2013

Employee Benefit and Other Plans [Abstract]

Employee Benefit Plans

Note 4—Employee Benefit Plans

Share-based Compensation: As of March 31, 2013, we had approximately 5.8 million share-based awards outstanding, approximately 0.3 million of which were restricted stock units and other share based awards, and the rest of which were common stock options. In addition, we had approximately 2.3 million share-based awards available for grant. We recorded share-based compensation expense as follows:

	For the three months ended March 31,
	2013		2012
	(in millions)
Share-based compensation expense	$	1.8	$	2.0

Stock options: The following table summarizes information related to our common stock options:

	Number of Stock Options		Weighted Average Exercise Price
Options outstanding at January 1, 2013	5,519,345		$	11.78
Granted	67,000		$	15.58
Exercised	(96,159	)	$	9.98
Canceled, Forfeited	(44,550	)	$	12.94
Options outstanding at March 31, 2013	5,445,636		$	11.85
Options exercisable at March 31, 2013	2,780,461		$	12.68
Expected to vest after March 31, 2013	2,019,114		$	10.99

The unamortized compensation costs not yet expensed related to stock options totaled approximately $13.0 million at March 31, 2013 and the weighted average period over which the costs are expected to be recognized is approximately two years. The aggregate amount of cash we received from the exercise of stock options was $1.0 million and $0.6 million for the three months ended March 31, 2013 and 2012, respectively. The associated shares were newly issued common stock.

The following information is provided for our stock options:

	For the three months ended March 31,
	2013		2012
Weighted-average grant date fair value	$	7.82	$	5.67

Non-vested Shares: The following table summarizes information related to our non-vested shares, which includes restricted stock units:

	Number of Shares		Weighted Average Grant Date Fair Value
Unvested shares at January 1, 2013	220,537		$	11.33
Granted	128,092		$	14.34
Vested	(31,431	)	$	13.56
Canceled, Forfeited	—		$	—
Unvested shares at March 31, 2013	317,198		$	12.33

Unamortized compensation costs not yet expensed attributable to non-vested shares totaled approximately $3.4 million at March 31, 2013 and the weighted average period over which the costs are expected to be recognized is approximately two years.