Employee Benefit Plans (Tables)

12 Months Ended

Dec. 31, 2016

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

Schedule Of Stock-Based Compensation Expense

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



	Year Ended December 31,
	2014		2015		2016
Cost of revenue	$	2,227	$	3,836	$	6,214
Technology and development	1,209		1,190		2,536
Sales and marketing	2,466		2,724		3,127
General and administrative	8,656		12,856		18,391
Total	14,558		20,606		30,268

Summary Of Weighted-Average Fair Value Of Stock Options Granted

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



	Year Ended December 31,
	2014		2015		2016
Stock options granted (in thousands)	1,026		501		825
Weighted-average fair value at date of grant	$	20.06	$	18.89	$	18.38

Summary Of Stock Option Activity

Stock option activity for the year ended December 31, 2016 is as follows (shares in thousands):



	Shares		Weighted-average exercise price		Remaining contractual term (years)	Aggregate intrinsic value (dollars in thousands)
Outstanding at December 31, 2015	3,037		$	25.18	6.41	$	65,229
Granted	825		48.36
Exercised	(926	)	17.36
Forfeited	(92	)	47.01
Outstanding as of December 31, 2016	2,844		$	33.74	7.00	$	110,256
Vested and expected to vest at December 31, 2016	2,715		$	33.12	6.92	$	106,927
Exercisable at December 31, 2016	1,484		$	21.81	5.45	$	75,213

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:



	Year Ended December 31,
	2014		2015		2016
Expected volatility	46.90	%	43.48	%	42.63	%
Risk-free interest rate	1.87	%	1.56	%	1.17	%
Expected term (in years)	6.09		4.74		4.87
Dividend yield	—	%	—	%	—	%

Summary Of Restricted Stock Units

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



						Weighted-average grant date fair value
	Service-based RSUs		Performance-based RSUs		Market-based RSUs	Service-based RSUs		Performance-based RSUs		Market-based RSUs
	(shares in thousands)
Unvested at December 31, 2015	193		404		166	$	41.89	$	44.36	$	49.38
Granted ⁽¹⁾	171		351		—	54.88		38.88		—
Vested ⁽²⁾	(84	)	(264	)	—	39.62		24.68		—
Forfeitures	(23	)	—		—	50.76		—		—
Unvested at December 31, 2016	257		491		166	$	50.49	$	51.03	$	49.38

(1)

Includes additional shares issued as specified financial metrics for the performance-based restricted stock units, granted to certain executives in 2013, during the performance period of January 1, 2013 through December 31, 2015 were met, resulting in actual shares vesting at 150% of the target number of shares originally granted. The weighted average grant date fair value of these additional shares was $24.68.


(2)	Includes 264,000 shares vested from performance-based restricted stock units granted to certain executives in 2013 representing 150% of the target number of shares originally granted.