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Condensed Consolidated Statements of Cash Flows (USD $)
In Thousands, unless otherwise specified
9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Cash flows from operating activities:    
Net loss $ (134,724) $ (49,476)
Adjustments to reconcile net loss to net cash provided by operating activities:    
Depreciation and amortization 28,734 16,316
Accretion (Amortization) of Discounts and Premiums, Investments 6,044 3,441
Amortization of deferred commissions 36,398 19,825
Amortization of debt discount and issuance cost 21,608 0
Stock-based compensation 108,323 44,725
Tax benefit from exercise of stock options (1,190) (1,817)
Other Operating Activities, Cash Flow Statement (1,973) 1,236
Changes in operating assets and liabilities:    
Accounts receivable (6,935) (6,988)
Deferred commissions (47,115) (34,894)
Prepaid expenses and other assets (2,386) 1,077
Accounts payable 3,892 (408)
Accrued expenses and other liabilities 92,351 54,332
Deferred revenue (11,751) (1,890)
Net cash provided by operating activities 91,276 45,479
Cash flows from investing activities:    
Purchases of property and equipment (45,499) (39,059)
Payments to Acquire Businesses, Net of Cash Acquired 99,813 13,330
Purchases of investments (360,783) (233,444)
Sale of investments 97,807 50,403
Maturities of investments 134,618 142,456
Restricted cash (55) (174)
Net cash used in investing activities (273,725) (93,148)
Cash flows from financing activities:    
Offering costs in connection with follow-on offering 0 (698)
Proceeds from Issuance of Common Stock 53,904 47,833
Tax benefit from exercise of stock options 1,190 1,817
Net cash provided by financing activities 55,094 48,952
Foreign currency effect on cash and cash equivalents (3,862) 822
Net increase (decrease) in cash and cash equivalents (131,217) 2,105
Cash and cash equivalents at beginning of period 366,303 118,989
Cash and cash equivalents at end of period 235,086 121,094
Supplemental disclosures of non-cash investing activities:    
Property and equipment included in accounts payable and accrued expenses $ 6,220 $ 5,360