Condensed Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Cash flows from operating activities
Net loss	$ (5,302)	$ (988)
Adjustments to reconcile net loss including non-controlling interests to net cash provided by operating activities:
Depreciation and amortization of property and equipment	5,784	4,133
Amortization of intangible assets	925	399
Stock-based compensation	1,517	602
Excess tax benefits from stock-based compensation		(3,419)
Change in fair value of contingent consideration	(378)
Changes in operating assets and liabilities, net of effect of acquisition:
Accounts receivable	(1,719)	(2,436)
Prepaid expenses and other assets	13	1,282
Accounts payable	(156)	(491)
Accrued expenses and other liabilities	(291)	(720)
Deferred revenue	7,678	6,894
Net cash provided by operating activities	8,071	5,256
Cash flows from investing activities
Purchases of marketable securities	(22,682)	(22,744)
Proceeds from sales of marketable securities	18,358	19,078
Purchases of property and equipment	(16,004)	(5,154)
Payments for business acquisition, net of cash acquired		(4,874)
Net cash used in investing activities	(20,328)	(13,694)
Cash flows from financing activities
Excess tax benefits from stock-based compensation		3,419
Proceeds from exercise of stock options	95	214
Payments of capital leases and notes payable	(180)	(27)
Payments of acquired notes payable and financed liabilities		(6,079)
Payments of holdback consideration	(275)
Payments of withholding tax on net issuance of restricted stock units	(586)
Payments to non-controlling interests	(619)	(579)
Net cash used in financing activities	(1,565)	(3,052)
Net decrease in cash and cash equivalents	(13,822)	(11,490)
Cash and cash equivalents at beginning of period	27,338	58,138
Cash and cash equivalents at end of period	13,516	46,648
Supplemental disclosure of cash flow information
Cash paid for taxes	9	42
Supplemental disclosure of non-cash investing and financing activities
Property and equipment costs in accounts payable, accrued expenses and other liabilities	8,483	3,383
Assets acquired in business acquisition		17,317
Liabilities assumed in business acquisition		$ 12,443