Condensed Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012
Cash flows from operating activities
Net (loss) income	$ (1,214)	$ 3,413
Adjustments to reconcile net (loss) income including non-controlling interests to net cash provided by operating activities:
Depreciation and amortization of property and equipment	8,867	7,873
Amortization of intangible assets	915	482
Stock-based compensation	1,847	1,945
Excess tax benefits from stock-based compensation	(3,138)	(588)
Changes in operating assets and liabilities, net of effect of acquisition:
Accounts receivable	(2,199)	(505)
Prepaid expenses and other assets	593	1,616
Accounts payable	(49)	214
Accrued expenses and other liabilities	673	(3,006)
Deferred revenue	2,970	1,876
Net cash provided by operating activities	9,265	13,320
Cash flows from investing activities
Purchases of marketable securities	(27,539)	(42,195)
Proceeds from sales of marketable securities	29,671
Purchases of property and equipment	(12,220)	(10,675)
Payments for business acquisition, net of cash acquired	(4,874)
Other		(14)
Net cash used in investing activities	(14,962)	(52,884)
Cash flows from financing activities
Excess tax benefits from stock-based compensation	3,138	588
Proceeds from exercise of stock options	291	1,885
Repurchase and retirement of common stock	(1,062)
Payments of capital leases and notes payable	(59)	(174)
Payments of acquired notes payable and financed liabilities	(6,079)
Payments to non-controlling interests	(578)	(642)
Net cash (used in) provided by financing activities	(4,349)	1,657
Net decrease in cash and cash equivalents	(10,046)	(37,907)
Cash and cash equivalents at beginning of period	58,138	93,933
Cash and cash equivalents at end of period	48,092	56,026
Supplemental disclosure of cash flow information
Cash paid for taxes	54	279
Supplemental disclosure of non-cash investing and financing activities
Property and equipment and software maintenance costs in accounts payable, accrued expenses and other liabilities	2,797	3,363
Assets acquired in business acquisition	17,317
Liabilities assumed in business acquisition	$ 12,443