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Noncash Share-based Compensation (Tables)

12 Months Ended

Dec. 31, 2014

Noncash Share-based Compensation [Abstract]

Schedule of Share-based Compensation Expense

Noncash share based compensation expense is allocated to expense categories on the Consolidated Statements of Comprehensive Income. The following table summarizes noncash share based compensation expense, net of amounts capitalized, for the years ended December 31, 2014, 2013 and 2012.

	For the Year Ended December 31,
	2014				2013				2012
Share-based compensation:
Cost of revenue	$	3,469			$	2,071			$	1,451
Operating expenses:
Selling and marketing	5,142				3,834				2,335
General and administrative	9,375				7,055				3,938
Research and development	4,679				3,139				1,921
Total included in operating expenses	19,196				14,028				8,194
Total share-based compensation expense	$	22,665			$	16,099			$	9,645

Schedule of Share-based Compensation, Stock Options, Activity [Table Text Block]

Stock Options:

The following table summarizes the Company’s stock option activity for the year ended December 31, 2014:

	Number of  shares under option			Weighted  average exercise price				Weighted  average remaining  contractual term (year)		Aggregate intrinsic value (1)
Outstanding, December 31, 2013	1,160			$	11.12
Granted	—			—
Exercised	(196)			7.37
Forfeited	—			—
Expired	(3)			14.93
Outstanding, December 31, 2014	961			$	11.87			2.80		$	15,006
Vested and exercisable at December 31, 2014	961			$	11.87			2.80		$	15,006

(1) The aggregate intrinsic value was calculated based on the positive difference between the estimated fair value of the Company’s common stock on December 31, 2014 of $27.48 and the grant date fair value.

Schedule of Share-based Compensation, Restricted Stock and Restricted Stock Units Activity [Table Text Block]

The following table summarizes the Company's unvested RSUs as of December 31, 2014, and changes during the year then ended, is as follows:

	Number of shares			Weighted  average grant date fair value				Weighted  average remaining  contractual term (year)		Aggregate intrinsic value  (1)
Unvested at December 31, 2013	1,543			$	18.25
Granted	1,028			33.46
Vested	(582	)		17.42
Forfeited	(125	)		25.28
Unvested at December 31, 2014	1,864			$	26.67			4.65		$	51,231
Expected to vest at December 31, 2014	1,822			$	26.60			4.64		$	50,067

(1) The aggregate intrinsic value was calculated based on the fair value of the Company’s common stock on December 31, 2014 of $27.48.

Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value [Table Text Block]

The following table summarizes the Company's SARs activity for the year ended December 31, 2014:

	Stock  appreciation rights			Weighted  average exercise price				Weighted  average remaining  contractual term (year)		Aggregate intrinsic value  (1)
Outstanding, December 31, 2013	721			$	10.74
Granted	—			—
Exercised	(48	)		10.59
Forfeited	—			—
Expired	—			—
Outstanding, December 31, 2014	673			$	10.75			5.82		$	11,260
Exercisable at December 31, 2014	662			$	10.74			5.81		$	11,083
Vested and expected to vest at December 31, 2014	673			$	10.75			5.82		$	11,260

(1) The aggregate intrinsic value was calculated based on the positive difference between the estimated fair value of the Company’s common stock on December 31, 2014 of $27.48 and the exercise price of the underlying SARs.

Schedule of Assumptions Used [Table Text Block]

Significant assumptions used in the Monte Carlo simulation model for MSUs granted during December 31, 2014, 2013 and 2012 are as follows:

	For the Year Ended December 31,
	2014	2013		2012
Volatility	50.86%	57%		61%
Risk-free interest rate	0.68%	0.35%		0.28%
Expected option life in years	2.88	2.84		1.9
Dividend yield	—	—		—

The assumptions related to fiscal year 2014 are presented on weighted average basis for the various awards granted throughout the period.

Employee stock purchase plan:

In June 2013, the Board of Directors authorized an Employee Stock Purchase Plan (“ESPP”) which provides for eligible employees to purchase shares on an after-tax basis in an amount between 1% and 10% of their annual pay: (i) on June 30 of each year at a 5% discount of the fair market value of our common stock on January 1 or June 30, whichever is lower, and (ii) on December 31 of each year at a 5% discount of the fair market value of our common stock on July 1 or December 31, whichever is lower. An employee may not purchase more than $5,000 in either of the six-month measurement periods described above or more than $10,000 annually. During the year ended December 31, 2014, the Company issued 13,392 shares under the ESPP. As of December 31, 2014, 486,608 shares remain authorized and available for issuance under the ESPP. As of December 31, 2014, the Company held approximately $0.4 million on behalf of employees for future purchases under the ESPP and this amount was recorded in accrued liabilities in the Company's consolidated balance sheet.

Schedule of Nonvested Performance-based Units Activity [Table Text Block]

	Number of  unvested awards			Weighted  average grant date fair value				Weighted  average remaining  contractual term (year)		Aggregate intrinsic value (1)
Unvested at December 31, 2013	469			34.24
Granted	198			$	48.54
Exercised	(205	)		26.08
Forfeited	(18	)		43.07
Expired	—			—
Unvested at December 31, 2014	444			$	44.03			6.30		$	12,209

(1) The aggregate intrinsic value was calculated based on the positive difference between the estimated fair value of the Company’s common stock on December 31, 2014 of $27.48 and the grant date fair value of the underlying MSUs.

Market Stock Units Valuation Assumptions [Table Text Block]

Significant assumptions used in the Monte Carlo simulation model for MSUs granted during December 31, 2014, 2013 and 2012 are as follows:

	For the Year Ended December 31,
	2014	2013		2012
Volatility	50.86%	57%		61%
Risk-free interest rate	0.68%	0.35%		0.28%
Expected option life in years	2.88	2.84		1.9
Dividend yield	—	—		—

The assumptions related to fiscal year 2014 are presented on weighted average basis for the various awards granted throughout the period.

Employee stock purchase plan:

In June 2013, the Board of Directors authorized an Employee Stock Purchase Plan (“ESPP”) which provides for eligible employees to purchase shares on an after-tax basis in an amount between 1% and 10% of their annual pay: (i) on June 30 of each year at a 5% discount of the fair market value of our common stock on January 1 or June 30, whichever is lower, and (ii) on December 31 of each year at a 5% discount of the fair market value of our common stock on July 1 or December 31, whichever is lower. An employee may not purchase more than $5,000 in either of the six-month measurement periods described above or more than $10,000 annually. During the year ended December 31, 2014, the Company issued 13,392 shares under the ESPP. As of December 31, 2014, 486,608 shares remain authorized and available for issuance under the ESPP. As of December 31, 2014, the Company held approximately $0.4 million on behalf of employees for future purchases under the ESPP and this amount was recorded in accrued liabilities in the Company's consolidated balance sheet.

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