Stock-Based Compensation (Tables)

3 Months Ended

Mar. 31, 2013

Stock-Based Compensation

Schedule of the stock option activity

	Options			Weighted-Average Exercise Price
Outstanding at January 1, 2013		1,432,228		$	10.34
Granted		111,147		$	24.68
Exercised		(156,665	)	$	6.13
Forfeited		(2,896	)	$	19.36
Outstanding at March 31, 2013		1,383,814		$	11.95

Schedule of the fair value and assumptions used in determining the fair value of stock options granted for fixed awards with graded vesting schedules

	2013	2012
Risk-free interest rate	1.0%	1.2 - 1.4%
Expected dividend yield	0.0%	0.0%
Weighted average expected volatility	50%	50%
Expected term	6.0 years	6.0 - 6.3 years
Weighted average grant-date fair value	$11.74	$8.57

Schedule of restricted stock activity

	Shares			Weighted-Average Grant Date Fair Value
Outstanding at January 1, 2013		185,764		$	19.54
Granted		69,882		$	24.68
Vested		(45,939	)	$	19.50
Forfeited		(1,562	)	$	19.16
Outstanding at March 31, 2013		208,145		$	21.27

Schedule of performance awards activity

	Shares		Weighted-Average Grant Date Fair Value
Outstanding at January 1, 2013		74,923	$	20.51
Granted		46,106	$	24.68
Outstanding at March 31, 2013		121,029	$	22.10