CONSOLIDATED AND CONDENSED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014
Cash flows from operating activities
Net loss	$ (61,948)	$ (75,544)
Adjustments to reconcile net loss to net cash used in operating activities
Depreciation and amortization	23,351	14,438
Equity based compensation	21,741	5,528
Gain on sale of a business	(2,997)	0
Other non-cash adjustments	1,395	888
Changes in operating assets and liabilities:
Accounts receivable	(3,832)	2,376
Inventories	(2,778)	(6,155)
Prepaid expenses and other current assets	(28,419)	(12,721)
Accounts payable and accrued expenses	60,340	(1,108)
Deferred revenue and other liabilities	37,927	24,578
Other assets	(25)	(3,117)
Net cash provided by (used in) operating activities	44,755	(50,837)
Cash flows from investing activities
Purchase of short-term and long-term investments	(141,309)	(110,000)
Sale and maturities of short-term investments	78,715	59,964
Purchase of property and equipment	(36,695)	(31,168)
Site and software development costs	(13,107)	(10,643)
Cash received from the sale of a business (net of cash sold)	2,860	0
Other investing activities, net	302	(3,015)
Net cash used in investing activities	(109,234)	(94,862)
Cash flows from financing activities
Taxes paid related to net share settlement of equity awards	(12,899)	0
Net proceeds from exercise of stock options	374	0
Net proceeds from issuance of Series B convertible redeemable preferred units	0	154,774
Repurchase of common units	0	(23,500)
Dividends paid to Series A convertible redeemable preferred holders	0	(15,000)
Repurchase of employee equity	0	(5,528)
Net cash (used in) provided by financing activities	(12,525)	110,746
Effect of exchange rate changes on cash and cash equivalents	(165)	(29)
Net (decrease) in cash and cash equivalents	(77,169)	(34,982)
Cash and cash equivalents
Beginning of period	355,859	65,289
End of period	278,690	30,307
Supplemental disclosure of non-cash investing activities
Purchase of property and equipment included in accounts payable and accrued expenses and in other liabilities	2,636	2,079
Construction costs capitalized under finance lease obligations	8,687	0
Supplemental disclosure of non-cash financing activities
Accretion of preferred unit dividends	$ 0	$ 16,503