Stock-Based Compensation (Tables)

6 Months Ended

Jun. 30, 2015

The following table summarizes stock option activity for both the employee and non-employee director stock option plans for the period indicated.


	Options			Weighted- Average Exercise Price/Share		Weighted-Average Remaining Contractual Life (in years)		Aggregate Intrinsic Value (in thousands)

Six Months Ended June 30, 2015:
Outstanding – January 1, 2015		1,859,350		$	23.49
Granted		2,000			40.82
Exercised		(99,050	)		10.06
Forfeited		(74,350	)		26.13

Outstanding – June 30, 2015		1,687,950			24.18		5.3	$	36,400	⁽¹⁾

Fully vested and exercisable – June 30, 2015		315,550		$	14.17		4.6	$	9,966	⁽¹⁾

Expected to vest in future periods		1,248,680

Fully vested and expected to vest – June 30, 2015⁽²⁾		1,564,230		$	23.58		5.2	$	34,676	⁽¹⁾

(1)	Based on closing price of $45.75 per share on June 30, 2015.

(2)	At June 30, 2015, the Company estimated that outstanding options to purchase 123,720 shares of its common stock would not vest and would be forfeited prior to their vesting date.

The following table summarizes non-vested restricted stock activity for the period indicated.


	Six Months Ended June 30, 2015
Outstanding – January 1, 2015		444,700
Granted		245,300
Forfeited		(29,875	)
Vested		0

Outstanding – June 30, 2015		660,125


Weighted-average grant date fair value	$	25.27