Employee Benefit Plans (Tables)

6 Months Ended

Jun. 30, 2016

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

Summary Of Weighted-Average Fair Value Of Stock Options Granted

The following table summarizes the weighted-average fair value of stock options granted:

	Three Months Ended June 30,				Six Months Ended June 30,
	2015		2016		2015		2016
Stock options granted (in thousands)	14		281		51		777
Weighted-average fair value at date of grant	$	17.87	$	20.84	$	22.34	$	18.14

Summary Of Stock Option Activity

Stock option activity for the six months ended June 30, 2016 was as follows (shares in thousands):

	Shares		Weighted-average exercise price		Remaining contractual term (in years)	Aggregate intrinsic value (in thousands)
Outstanding at December 31, 2015	3,037		$	25.18	6.41	$	65,229
Granted	777		47.64
Exercised	(637	)	15.17
Forfeited	(67	)	45.45
Outstanding as of June 30, 2016	3,110		$	32.40	7.29	$	85,303
Vested and expected to vest at June 30, 2016	2,958		$	31.72	7.20	$	83,136
Exercisable at June 30, 2016	1,502		$	18.23	5.45	$	62,492

Schedule Of Weighted Average Assumptions

The Company calculated the fair value of each option award on the date of grant using the Black-Scholes option pricing model with the following weighted-average assumptions:  

	Three Months Ended June 30,				Six Months Ended June 30,
	2015		2016		2015		2016
Expected volatility	43.15	%	42.42	%	43.99	%	42.71	%
Risk-free interest rate	1.51	%	1.31	%	1.54	%	1.17	%
Expected term (in years)	4.74		4.87		4.74		4.87
Dividend yield	—		—		—		—

Schedule Of Revenue Growth Targets

The following table describes the levels of revenue growth target that must be met for the specified performance period for the restricted stock units granted in 2016 to vest:

Achievement of Revenue Growth Objective	Percentage of Restricted Stock Unit Vesting
20% and Greater	200% will vest
Between 15% but less than 20%	Between 100% and 200% will vest
Between 10% but less than 15%	Between 50% and 100% will vest
Below 10%	None will vest

Summary Of Restricted Stock Units

The following table summarizes information about restricted stock units issued to officers, directors and employees under the 2010 Plan (shares in thousands):

	Shares		Weighted-Average Grant Date Fair Value
Unvested at December 31, 2015	763		$	44.83
Granted (1)	475		37.98
Vested (2)	(328	)	20.55
Forfeited	(10	)	45.20
Unvested at June 30, 2016	900		$	50.04

Schedule Of Stock-Based Compensation Expense

Stock-based compensation is classified in the condensed consolidated statements of income (loss) in the same expense line items as cash compensation. Amounts recorded as expense in the condensed consolidated statements of income (loss) were as follows (in thousands):  

	Three Months Ended June 30,				Six Months Ended June 30,
	2015		2016		2015		2016
			Restated				Restated
Cost of revenues	$	898	$	1,818	$	1,699	$	2,968
Technology and development	295		621		342		1,106
Sales and marketing	668		738		1,332		1,446
General and administrative	2,952		4,356		5,876		8,004
Total	$	4,813	$	7,533	$	9,249	$	13,524