Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Cash Flows From Operating Activities:
Net income	$ 10,851	$ 20,244	$ 6,697
Adjustments to reconcile net income to net cash provided by operating activities:
Loss (income) from discontinued operations	5,540	1,935	(6,629)
Stock-based compensation expense	2,040	1,487	523
Depreciation and amortization	19,185	15,303	369
Adjustment of deferred income taxes	(1,536)	(15,105)	1,395
Gain on sales of marketable securities	(2,608)	(282)	(1,713)
Reversal of tax reserves	(7,236)	0	0
Loss on equity-method investees	863	0	0
Loss on extinguishment of debt	463	0	0
Other	471	2,436	(102)
Changes in operating assets and liabilities, net of effects of acquisitions:
Accounts receivable	2,653	(5,469)	(569)
Assets held for sale	0	0	6,216
Prepaid expenses and other assets	(833)	(1,102)	2,033
Accounts payable and other liabilities	(2,044)	(195)	(5,757)
Net cash provided by (used in) operating activities of discontinued operations	(2,116)	(847)	6,647
Net cash provided by operating activities	25,693	18,405	9,110
Cash Flows From Investing Activities:
Purchases of businesses, net of cash acquired	(61,888)	(52,567)	(36,530)
Purchases of property and equipment	(8,932)	(11,818)	(65)
Proceeds from sale of property and equipment	552	0	0
Investments in cost method investee	(25,000)	0	0
Investments in equity method investees	(9,202)	0	0
Purchases of marketable securities	(189,268)	(523,443)	(537,898)
Sales of marketable securities	75,825	574,074	442,939
Maturities of marketable securities	145,994	64,253	92,321
Net cash provided by investing activities of discontinued operations	0	75	0
Net cash provided by (used in) investing activities	(71,919)	50,574	(39,233)
Cash Flows From Financing Activities:
Proceeds from issuance of common stock	0	0	29
Repurchases of common stock	(29,384)	(2,776)	0
Proceeds from issuance of long-term debt	95,000	0	0
Payments for debt issuance costs	(1,368)		0
Repayments of capital lease obligations	(413)	(230)	0
Repayments of long-term debt	(15,500)	(3,000)	0
Net cash provided by (used in) financing activities	48,335	(6,006)	29
Net increase in cash and cash equivalents	2,109	62,973	(30,094)
Effect of foreign currency translation on cash and cash equivalents	(63)	96	305
Cash and cash equivalents at beginning of period	71,556	8,487	38,276
Cash and cash equivalents at end of period	$ 73,602	$ 71,556	$ 8,487