Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Cash flows from operating activities
Net loss	$ (22,178)	$ (18,767)	$ (3,318)
Adjustments to reconcile net loss including non-controlling interests to net cash provided by operating activities:
Depreciation and amortization of property and equipment	38,293	27,446	18,940
Amortization of intangible assets	3,576	3,716	2,250
Impairment loss	242	959	0
Stock-based compensation	9,398	7,164	4,506
Excess tax benefits from stock-based compensation	0	0	(55)
Change in fair value of contingent consideration	(114)	(811)	(367)
Change in deferred income taxes	320	468	1,615
Changes in operating assets and liabilities, net of effect of acquisition:
Accounts receivable	(15,746)	(11,392)	(2,403)
Prepaid expenses and other assets	(3,459)	(1,935)	1,648
Accounts payable	3,845	(2,252)	(242)
Accrued expenses and other liabilities	4,569	4,739	(1,307)
Deferred revenue	79,829	11,872	(596)
Net cash provided by operating activities	98,575	21,207	20,671
Cash flows from investing activities
Decrease in restricted cash	0	545	0
Purchases of marketable securities	0	(27,163)	(33,430)
Proceeds from sales of marketable securities	1,614	58,511	42,026
Purchases of property and equipment	(103,116)	(70,945)	(29,500)
Payments for business acquisitions, net of cash acquired	0	(147)	(19,459)
Other	0	0	(40)
Net cash used in investing activities	(101,502)	(39,199)	(40,403)
Cash flows from financing activities
Proceeds from credit facility	20,000	3,500	0
Principal payments on debt	(5,875)	0	0
Debt issuance costs	(62)	(711)	0
Proceeds from exercise of stock options	1,373	1,158	614
Repurchase and retirement of common stock	0	0	(4,848)
Excess tax benefits from stock-based compensation	0	0	55
Payments of capital leases and notes payable	(814)	(627)	(187)
Payments of acquired notes payable and financed liabilities	0	0	(6,079)
Payment of holdback consideration	(1,600)	0	0
Payment of other acquisition related consideration	(17)	(1,255)	0
Payments of withholding tax on net issuance of restricted stock units	(2,512)	(1,922)	(15)
Payments to non-controlling interest	(500)	(623)	(608)
Purchase of non-controlling interests	(1,150)	0	0
Net cash provided by (used in) financing activities	8,843	(480)	(11,068)
Effect of exchange rates on cash	(47)	(17)	0
Net decrease in cash and cash equivalents	5,869	(18,489)	(30,800)
Cash and cash equivalents at beginning of year	8,849	27,338	58,138
Cash and cash equivalents at end of year	14,718	8,849	27,338
Supplemental disclosure of cash flow information
Cash paid for interest	347	33	32
Cash paid (received) for taxes, net of refunds	62	(53)	96
Supplemental disclosure of non-cash investing and financing activities
Property and equipment costs in accounts payable, accrued expenses and other liabilities	45,417	11,647	10,283
Acquisition of equipment under capital lease	3,839	361	0
Assets acquired in business acquisition	0	0	39,794
Liabilities assumed in business acquisition	$ 0	$ 0	$ 16,151