Condensed Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012
Cash flows from operating activities
Net (loss) income	$ (690)	$ 6,474
Adjustments to reconcile net (loss) income including non-controlling interests to net cash provided by operating activities:
Depreciation and amortization of property and equipment	13,611	11,672
Amortization of intangible assets	1,456	778
Stock-based compensation	3,199	2,163
Excess tax benefits from stock-based compensation	(1,796)	(1,041)
Change in deferred income taxes	5	(420)
Changes in operating assets and liabilities, net of effect of acquisition:
Accounts receivable	(2,057)	(3,382)
Prepaid expenses and other assets	(296)	1,767
Accounts payable	(509)	(821)
Accrued expenses and other liabilities	(1,695)	(3,552)
Deferred revenue	1,332	3,596
Net cash provided by operating activities	12,560	17,234
Cash flows from investing activities
Purchases of marketable securities	(33,399)	(52,232)
Proceeds from sales of marketable securities	38,464	15,013
Purchases of property and equipment	(19,150)	(15,755)
Payments for business acquisition, net of cash acquired	(4,874)	(3,185)
Other		(14)
Net cash used in investing activities	(18,959)	(56,173)
Cash flows from financing activities
Excess tax benefits from stock-based compensation	1,796	1,041
Proceeds from exercise of stock options	540	2,125
Repurchase and retirement of common stock	(2,556)
Payments of capital leases and notes payable	(96)	(190)
Payments of acquired notes payable and financed liabilities	(6,079)
Payments to non-controlling interests	(598)	(620)
Net cash (used in) provided by financing activities	(6,993)	2,356
Net decrease in cash and cash equivalents	(13,392)	(36,583)
Cash and cash equivalents at beginning of period	58,138	93,933
Cash and cash equivalents at end of period	44,746	57,350
Supplemental disclosure of cash flow information
Cash paid for taxes	54	650
Supplemental disclosure of non-cash investing and financing activities
Property and equipment and software maintenance costs in accounts payable, accrued expenses and other liabilities	4,679	4,129
Assets acquired in business acquisition	17,317
Liabilities assumed in business acquisition	$ 12,443