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 income	$ 6,019	$ 20,189
Adjustments to reconcile net income to net cash provided by (used in) operating activities:
Loss from discontinued operations	0	1,986
Stock-based compensation expense	1,979	857
Depreciation and amortization	14,417	10,324
Adjustment of deferred income taxes	(2,364)	(15,079)
Gain on sales of marketable securities	(1,834)	(98)
Loss on extinguishment of debt	463	0
Other	373	1,153
Changes in operating assets and liabilities, net of effects of acquisitions:
Accounts receivable	2,354	(21,532)
Prepaid expenses and other assets	(2,019)	(1,355)
Accounts payable	(4,682)	1,177
Accrued expenses and other liabilities	2,640	280
Net cash used in operating activities of discontinued operations	0	(823)
Net cash provided by (used in) operating activities	17,346	(2,921)
Cash Flows From Investing Activities:
Purchases of businesses, net of cash acquired	(1,125)	(52,492)
Purchases of property and equipment	(6,248)	(7,607)
Proceeds from sale of property and equipment	527	0
Investments in cost method investee	(25,000)	0
Investments in equity method investees	(9,202)	0
Purchases of marketable securities	(161,288)	(498,964)
Sales of marketable securities	65,474	568,634
Maturities of marketable securities	134,669	51,804
Net cash provided by investing activities of discontinued operations	0	75
Net cash provided by (used in) investing activities	(2,193)	61,450
Cash Flows From Financing Activities:
Repurchases of common stock	(17,816)	0
Proceeds from issuance of long-term debt	70,000	0
Payments for debt issuance costs	(1,130)
Repayments of capital lease obligations	(314)	(126)
Repayments of long-term debt	(15,500)	(2,000)
Net cash provided by (used in) financing activities	35,240	(2,126)
Net increase in cash and cash equivalents	50,393	56,403
Effect of foreign currency translation on cash and cash equivalents	(35)	52
Cash and cash equivalents, beginning balance	71,556	8,487
Cash and cash equivalents, ending balance	$ 121,914	$ 64,942