Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014
Cash flows from operating activities
Net loss	$ (13,655)	$ (8,827)
Adjustments to reconcile net loss including non-controlling interests to net cash provided by operating activities:
Depreciation and amortization of property and equipment	17,866	12,315
Amortization of intangible assets	1,766	1,853
Impairment loss	160
Loss on disposal of fixed assets	(5)
Stock-based compensation	3,934	3,368
Change in fair value of contingent consideration	(114)	(358)
Change in deferred income taxes	207	230
Changes in operating assets and liabilities:
Accounts receivable	(12,600)	(10,271)
Prepaid expenses and other assets	(1,275)	(718)
Accounts payable	2,237	5,531
Accrued expenses and other liabilities	911	(845)
Deferred revenue	35,395	13,230
Net cash provided by operating activities	34,837	15,508
Cash flows from investing activities
Purchases of marketable securities		(27,137)
Proceeds from sales of marketable securities	1,614	30,190
Purchases of property and equipment	(33,306)	(35,886)
Proceeds from Sale of Property and Equipment	8
Net cash used in investing activities	(31,684)	(32,833)
Cash flows from financing activities
Proceeds from credit facility	15,000
Principal payments on debt	(5,438)
Proceeds from exercise of stock options	1,028	179
Payments of capital leases and notes payable	(188)	(348)
Payment of other acquisition related consideration	(17)	(275)
Payments of withholding tax on net issuance of restricted stock units	(1,354)	(992)
Payments to non-controlling interests	(500)	(623)
Net cash provided by (used in) financing activities	8,531	(2,059)
Effect of exchange rates on cash	(15)
Net increase (decrease) in cash and cash equivalents	11,669	(19,384)
Cash and cash equivalents at beginning of period	8,849	27,338
Cash and cash equivalents at end of period	20,518	7,954
Supplemental disclosure of non-cash investing and financing activities
Property and equipment costs in accounts payable, accrued expenses and other liabilities	33,202	$ 12,075
Acquisition of equipment under capital lease	$ 3,099