Stock Options And Employee Stock Purchase Plan (Tables)

9 Months Ended

Sep. 30, 2013

Stock Options Activity

The following table represents stock option activity for the nine months ended September 30, 2013:

	Number of Shares		Weighted- Average Exercise Price		Weighted-Average Remaining Contractual Term (in years)	Aggregate Intrinsic Value
Outstanding at January 1, 2013	1,765,461		$	22.08
Granted	—		—
Exercised	(562,173	)	24.04
Canceled	(20,600	)	21.79
Outstanding at September 30, 2013	1,182,688		21.16		4.3	$	33,542,013
Exercisable at September 30, 2013	836,229		20.25		3.3	$	24,476,289
Vested and expected to vest at September 30, 2013	1,127,602		$	20.94	4.1	$	32,231,627

Assumptions To Estimate Fair Value Of Stock Options

The weighted-average fair values of stock options granted have been estimated utilizing the following assumptions, no stock options were granted during the nine month period ended September 30, 2013:

	Nine Months Ended September 30,
	2012
Risk-free interest rate	0.91%
Expected term (in years)	5.7
Dividend yield	3.09%
Expected volatility	41%
Weighted-average volatility	41%

Allocation Of Share-Based Compensation Expense

The following table represents share-based compensation expense included in cost of revenues and operating expenses in the accompanying condensed consolidated statements of income for the three and nine months ended September 30, 2013 and 2012 (in thousands):

	Three Months Ended September 30,				Nine Months Ended September 30,
	2013		2012		2013		2012
Cost of revenues	$	162	$	199	$	581	$	633
Operating expenses:
Sales and marketing	465		390		1,315		1,117
Research, development and engineering	103		111		311		344
General and administrative	1,695		1,703		4,901		4,757
Total	$	2,425	$	2,403	$	7,108	$	6,851

Restricted Stock [Member]

Restricted Stock And Restricted Stock Unit Award Activity

Restricted stock award activity for the nine months ended September 30, 2013 is set forth below:

	Shares		Weighted-Average Grant-Date Fair Value
Nonvested at January 1, 2013	828,475		$	23.08
Granted	178,430		38.40
Vested	(291,841	)	21.33
Canceled	(43,900	)	24.46
Nonvested at September 30, 2013	671,164		$	27.82

Restricted Stock Units (RSUs) [Member]

Restricted Stock And Restricted Stock Unit Award Activity

Restricted stock unit award activity for the nine months ended September 30, 2013 is set forth below:

	Number of Shares		Weighted-Average Remaining Contractual Term (in years)	Aggregate Intrinsic Value
Outstanding at January 1, 2013	115,466
Granted	26,675
Vested	(10,116	)
Canceled	(33,000	)
Outstanding at September 30, 2013	99,025		2.3	$	4,903,718
Vested and expected to vest at September 30, 2013	67,640		2.0	$	3,349,522