Employee Stock-Based Compensation (Tables)

12 Months Ended

Dec. 31, 2014

Disclosure of Compensation Related Costs, Share-based Payments [Abstract]

Stock-based Compensation Expense

Stock-based compensation for the years ended December 31, 2014, 2013, and 2012 includes expense related to awards of stock options and restricted stock units and purchases under the 2010 Employee Stock Purchase Plan. Total stock-based compensation expense and the related income tax benefit were as follows:

	Year Ended December 31,
	2014		2013		2012
	(In thousands)
Total stock-based compensation expense	$	20,329	$	14,703	$	12,734
Related income tax benefit	6,949		4,007		3,394

Summary of Stock Options and Restricted Stock Units Granted

The following table summarizes stock options and restricted stock units granted:

	Year Ended December 31,
	2014		2013		2012
	(In thousands, except per share data)
Stock options granted	106		2,236		2,247
Weighted-average exercise price	$	20.92	$	18.88	$	19.35
Weighted-average grant-date fair value	$	10.75	$	7.20	$	8.92
Restricted stock units granted	2,035		1,272		613
Weighted-average grant-date fair value	$	19.49	$	22.16	$	14.14

Schedule of Stock Options Valuation Assumptions

We estimated the fair value of each stock option grant on the date of grant using the following weighted-average assumptions:

	Year Ended December 31,
	2014		2013		2012
Risk-free interest rate	1.8	%	1.2	%	1.0	%
Expected term (life) of options (in years)	5.79		5.86		6.07
Expected dividends	—		—		—
Expected volatility	53.98	%	43.4	%	47.5	%

Schedule of Stock Option Activity

Stock option activity for the year ended December 31, 2014 was as follows:

	Options		Weighted-Average Exercise Price		Weighted-Average Remaining Contractual Life (in Years)	Aggregate Intrinsic Value
	(In thousands, except per share data and years)
Outstanding at December 31, 2013	5,212		$	16.62
Options granted	106		20.92
Options exercised	(1,107	)	7.20
Options canceled	(589	)	20.98
Outstanding at December 31, 2014	3,622		$	18.91	6.76	$	13,493
Vested or expected to vest at December 31, 2014	3,521		18.90		6.72	$	13,202
Exercisable at December 31, 2014	2,162		18.79		5.82	$	8,752

The total intrinsic value of options exercised was $14.0 million, $17.9 million and $8.5 million for the years ended December 31, 2014, 2013, and 2012, respectively.

Schedule of Share-based Compensation, Restricted Stock and Restricted Stock Units Activity

Restricted stock unit activity for the year ended December 31, 2014 was as follows:

	Shares		Weighted-Average Grant-Date Fair Value
	(In thousands)
Outstanding at December 31, 2013	1,454		$	20.87
Restricted stock units granted	2,035		$	19.49
Restricted stock units canceled	(406	)	$	19.74
Restricted stock units vested	(331	)	$	19.51
Outstanding at December 31, 2014	2,752		$	20.18