Summary of Significant Accounting Policies (Tables)

12 Months Ended

Dec. 31, 2018

Accounting Policies [Abstract]

Schedule of Newly-Adopted Accounting Pronouncements

The following table details the changes to the consolidated balance sheet as of December 31, 2017 as a result of the retrospective adoption of the new revenue recognition standard (in thousands):

	As Previously Reported			Revenue Recognition Standard Adjustments			As Revised
ASSETS
Current assets:
Accounts receivable	$	459,127		$	2,330		$	461,457
Prepaid expenses and other current assets	137,809			35,044			172,853
Total current assets	1,308,872			37,374			1,346,246
Deferred income tax assets	51,069			(14,838		)	36,231
Other assets	112,829			23,536			136,365
Total assets	4,602,844			46,072			4,648,916
LIABILITIES AND STOCKHOLDERS' EQUITY
Current liabilities:
Deferred revenue	$	77,705		$	(7,210	)	$	70,495
Total current liabilities	463,904			(7,210		)	456,694
Deferred revenue	6,839			(777		)	6,062
Deferred income tax liabilities	15,510			2,313			17,823
Total liabilities	1,292,121			(5,674		)	1,286,447
Stockholders' equity:
Accumulated deficit	(742,408		)	51,746			(690,662		)
Total stockholders' equity	3,310,723			51,746			3,362,469
Total liabilities and stockholders' equity	4,602,844			46,072			4,648,916

The following table details the changes to the consolidated statements of income for the years ended December 31, 2017 and 2016 as a result of the retrospective adoption of the new revenue recognition standard (in thousands, except per share data):

	December 31, 2017							December 31, 2016
	As Previously Reported		Revenue Recognition Standard Adjustments			As Revised		As Previously Reported		Revenue Recognition Standard Adjustments		As Revised
Revenue	$	2,502,996	$	(13,961	)	$	2,489,035	$	2,340,049	$	7,939	$	2,347,988
Costs and operating expenses:
Cost of revenue (exclusive of amortization of acquired intangible assets)	875,758		79			875,837		809,001		105		809,106
Sales and marketing	493,632		(12,110		)	481,522		426,967		918		427,885
Total costs and operating expenses	2,186,777		(12,031		)	2,174,746		1,880,455		1,023		1,881,478
Income from operations	316,219		(1,930		)	314,289		459,594		6,916		466,510
Income before provision for income taxes	316,122		(1,930		)	314,192		459,446		6,916		466,362
Provision for income taxes	97,801		(6,375		)	91,426		143,314		2,321		145,635
Net income	218,321		4,445			222,766		316,132		4,595		320,727
Net income per share:
Basic	$	1.27	$	0.03		$	1.30	$	1.81	$	0.02	$	1.83
Diluted	$	1.26	$	0.03		$	1.29	$	1.79	$	0.03	$	1.82

The following table details the changes to the consolidated statement of cash flows for the years ended December 31, 2017 and 2016 as a result of the retrospective adoption of the new revenue recognition and statement of cash flow standards (in thousands):

	December 31, 2017
	As Previously Reported			Revenue Recognition Standard Adjustments			Cash Flow Standard Adjustments		As Revised
Cash flows from operating activities:
Net income	$	218,321		$	4,445		$	—	$	222,766
Adjustments to reconcile net income to net cash provided by operating activities:
Benefit for deferred income taxes	(869		)	(6,375		)	—		(7,244		)
Changes in operating assets and liabilities, net of effects of acquisitions:
Accounts receivable	(63,825		)	13,771			—		(50,054		)
Prepaid expenses and other current assets	(22,311		)	(6,657		)	—		(28,968		)
Deferred revenue	1,142			1,796			—		2,938
Other non-current assets and liabilities	21,422			(6,980		)	—		14,442
Net cash provided by operating activities	800,983			—			—		800,983
Cash flows from investing activities:
Other non-current assets and liabilities	(2,098		)	—			512		(1,586		)
Net cash used in investing activities	(459,677		)	—			512		(459,165		)
Effects of exchange rate changes on cash, cash equivalents and restricted cash	12,912			—			78		12,990
Net increase in cash, and cash equivalents and restricted cash	(10,787		)	—			590		(10,197		)
Cash, cash equivalents and restricted cash at beginning of period	324,169			—			457		324,626
Cash, cash equivalents and restricted cash at end of period	313,382			—			1,047		314,429

	December 31, 2016
	As Previously Reported			Revenue Recognition Standard Adjustments			Cash Flow Standard Adjustments		As Revised
Cash flows from operating activities:
Net income	$	316,132		$	4,595		$	—	$	320,727
Adjustments to reconcile net income to net cash provided by operating activities:
Provision for deferred income taxes	7,308			2,321			—		9,629
Changes in operating assets and liabilities, net of effects of acquisitions:
Accounts receivable	3,356			(6,326		)	—		(2,970		)
Prepaid expenses and other current assets	23,881			18,264			—		42,145
Deferred revenue	(1,213		)	(2,299		)	—		(3,512		)
Other non-current assets and liabilities	(9,647		)	(16,555		)	—		(26,202		)
Net cash provided by operating activities	871,812			—			—		871,812
Cash flows from investing activities:
Other non-current assets and liabilities	782			—			4		786
Net cash used in investing activities	(469,430		)	—			4		(469,426		)
Effects of exchange rate changes on cash, cash equivalents and restricted cash	(7,907		)	—			16		(7,891		)
Net increase in cash, and cash equivalents and restricted cash	34,696			—			20		34,716
Cash, cash equivalents and restricted cash at beginning of period	289,473			—			437		289,910
Cash, cash equivalents and restricted cash at end of period	324,169			—			457		324,626