Nature of Business and Basis of Presentation (Tables)

12 Months Ended

Dec. 31, 2013

Dec. 31, 2012

Organization, Consolidation and Presentation of Financial Statements [Abstract]

Schedule of effect of revisions to statement of operations and cash flows

The effect of the revisions to the consolidated statements of cash flows is as follows for the years ended December 31, 2012 and 2011 (in thousands):

	2012									2011
	As Previously Reported			Adjustment			As Revised			As Previously Reported			Adjustment			As Revised
Cash flows from operating activities:
Changes in operating assets and liabilities, net of effects from acquisitions:
Prepaid expenses and other current assets	$	6,066		$	291		$	6,357		$	(7,014	)	$	2,186		$	(4,828	)
Accounts payable and accrued expenses	59,653			(981		)	58,672			15,184			(7,970		)	7,214
Other non-current assets and liabilities	(4,070		)	305			(3,765		)	8,704			(493		)	8,211
Net cash provided by operating activities	530,405			(385		)	530,020			452,555			(6,277		)	446,278
Cash flows from investing activities:
Purchases of property and equipment	(165,642		)	(1,131		)	(166,773		)	(140,218		)	6,773			(133,445		)
Other non-current assets and liabilities	(250		)	1,062			812			272			(546		)	(274		)
Net cash (used in) provided by investing activities	(779,041		)	(69		)	(779,110		)	171,123			6,227			177,350
Cash flows from financing activities:
Proceeds related to the issuance of common stock under stock plans	44,660			454			45,114			25,252			50			25,302
Net cash used in financing activities	(108,483		)	454			(108,029		)	(294,088		)	50			(294,038		)
Net (decrease) increase in cash and cash equivalents	(357,208		)	—			(357,208		)	327,331			—			327,331

The effect of the revisions to the consolidated statements of operations is as follows for the years ended December 31, 2012 and 2011 (in thousands):

	2012							2011
	As Previously Reported		Adjustment			As Revised		As Previously Reported		Adjustment			As Revised
Cost of revenue	$	431,911	$	97,989		$	529,900	$	374,543	$	79,162		$	453,705
Research and development	74,744		—			74,744		52,333		—			52,333
Sales and marketing	304,404		(81,056		)	223,348		227,331		(64,314		)	163,017
General and administrative	227,033		(16,933		)	210,100		191,726		(14,848		)	176,878
Amortization of acquired intangible assets	20,962		—			20,962		17,070		—			17,070
Restructuring charges	406		—			406		4,886		—			4,886
Total costs and operating expenses	$	1,059,460	$	—		$	1,059,460	$	867,889	$	—		$	867,889

The effect of the revisions to the selected quarterly financial results reflected above, is as follows for the year ended December 31, 2012 (in thousands):

	First Quarter		Second Quarter		Third Quarter		Fourth Quarter
Year ended December 31, 2012:
Cost of revenue, as previously reported	$	102,566	$	107,457	$	109,995	$	111,893
Adjustment	22,359		23,803		24,226		27,601
Cost of revenue, as revised	$	124,925	$	131,260	$	134,221	$	139,494