Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015
Cash flows from operating activities
Net loss	$ (22,779)	$ (18,578)
Adjustments to reconcile net loss including non-controlling interests to net cash provided by operating activities:
Depreciation and amortization of property and equipment	34,801	27,899
Amortization of intangible assets	2,582	2,709
Impairment loss	49	191
Stock-based compensation	9,690	6,190
Change in fair value of contingent consideration	0	(114)
Change in deferred income taxes	324	285
Changes in operating assets and liabilities:
Accounts receivable	(509)	(22,548)
Prepaid expenses and other assets	(2,182)	(2,810)
Accounts payable	3,464	2,422
Accrued expenses and other liabilities	4,018	5,039
Deferred revenue	64,140	49,165
Net cash provided by operating activities	93,598	49,850
Cash flows from investing activities
Purchases of property and equipment	(92,045)	(63,429)
Proceeds from sales of marketable securities	0	1,614
Net cash used in investing activities	(92,045)	(61,815)
Cash flows from financing activities
Proceeds from credit facility	5,000	20,000
Principal payments on debt	(5,656)	(5,438)
Proceeds from exercise of stock options	1,981	1,247
Debt issuance costs	(124)	0
Payments of capital leases and notes payable	(1,889)	(427)
Payment of other acquisition related consideration	0	(17)
Payments of withholding tax on net issuance of restricted stock units	(2,112)	(1,984)
Purchase of non-controlling interests	0	(1,150)
Payments to non-controlling interest	(286)	(500)
Net cash (used in) provided by financing activities	(3,086)	11,731
Effect of exchange rates on cash	15	(59)
Net decrease in cash and cash equivalents	(1,518)	(293)
Cash and cash equivalents at beginning of period	14,718	8,849
Cash and cash equivalents at end of period	13,200	8,556
Supplemental disclosure of non-cash investing and financing activities
Property and equipment costs in accounts payable, accrued expenses and other liabilities	19,367	54,079
Purchase of equipment and prepaid maintenance services under capital financing arrangements	$ 4,560	$ 3,099