Stockholders' Equity (Tables)

12 Months Ended

Dec. 31, 2015

Equity [Abstract]

Schedule of Stock Option Activity

Stock option activity for the year ended December 31, 2015 is presented below (in thousands, except per share data and contractual term):

				Weighted -		Weighted -
				Average		Average
				Exercise		Remaining		Aggregate
	Number			Price Per		Contractual		Intrinsic
	of Shares			Share		Term (in years)		Value
Outstanding at December 31, 2014		1,954		$	33.81
Granted		462			33.70
Exercised		(67	)		28.76
Forfeited		(178	)		35.01
Outstanding at December 31, 2015		2,171		$	33.84		6.78	$	701
Exercisable at December 31, 2015		1,101		$	32.30		4.99	$	673
Vested and expected to vest at December 31, 2015		2,059		$	33.76		6.66	$	699

Schedule of Restricted Stock Unit Activity

RSU activity for the year ended December 31, 2015 is presented below (in thousands, except per share data):

				Weighted-
				Average
	Number of			Grant Date
	Shares			Fair Value
Unvested at December 31, 2014		433		$	35.64
Granted		258			31.50
Vested		(134	)		35.30
Forfeited		(53	)		35.12
Unvested at December 31, 2015		504		$	33.67

Summary of Shares Purchased by Employees Under the Stock Purchase Plan

Shares purchased by employees under the Stock Purchase Plan are as follows (in thousands, except per share data):

	Shares		Purchase
Purchase Period Ended	Purchased		Price
February 28, 2015		25	$	31.98
August 31, 2015		25	$	26.87
February 28, 2014		23	$	27.83
August 31, 2014		21	$	30.55