CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
OPERATING ACTIVITIES - continuing operations
Net income (loss)	$ (100,345,000)	$ (27,820,000)	$ 202,041,000
(Income) loss from discontinued operations, including gain on sale, net of tax	0	(14,026,000)	(232,339,000)
Adjustments to reconcile net loss to cash provided by (used in) operating activities:
Depreciation and amortization	19,751,000	14,069,000	11,701,000
Equity-based compensation	27,034,000	23,889,000	6,411,000
Impairment related and other	41,238,000	1,092,000	0
Other (income) loss	(1,692,000)	(5,300,000)	4,210,000
Equity (income) loss	0	776,000	2,963,000
Deferred income taxes	258,000	(4,510,000)	0
Income tax (benefit) expense related to income from discontinued operations	0	(8,934,000)	(17,571,000)
Changes in operating assets and liabilities - net of acquisitions:
Accounts receivable, net	3,107,000	(2,024,000)	(3,445,000)
Prepaid expenses and other assets	(835,000)	595,000	(817,000)
Accounts payable	(1,270,000)	(65,000)	(1,358,000)
Accrued expenses	2,560,000	252,000	1,192,000
Accrued compensation and benefits	3,010,000	510,000	3,310,000
Deferred revenue	7,827,000	7,765,000	5,325,000
Other liabilities	(1,202,000)	(488,000)	330,000
Cash flows provided by (used in) operating activities	(559,000)	(14,219,000)	(18,047,000)
INVESTING ACTIVITIES - continuing operations
Capital expenditures, net	(5,530,000)	(3,677,000)	(1,243,000)
Change in restricted cash	(1,074,000)	193,000	(834,000)
Proceeds from sales/distributions of ownership interests	1,415,000	33,822,000	388,968,000
Proceeds from marketable securities	0	0	760,000
Ownership acquisition, net of cash acquired	(3,578,000)	(215,225,000)	(14,638,000)
Increase in cash due to consolidation of subsidiaries	0	0	1,153,000
Cash flows provided by (used in) investing activities	(8,767,000)	(184,887,000)	374,166,000
FINANCING ACTIVITIES – continuing operations
Acquisition of noncontrolling interest in subsidiary equity	(10,319,000)	(878,000)	(15,430,000)
Contingent consideration payments	(1,870,000)	0	0
Borrowings of short-term debt	820,000	0	4,900,000
Repayment of long-term debt and capital lease obligations	(24,000)	(12,641,000)	(2,480,000)
Purchase of treasury stock	(1,704,000)	(12,809,000)	(12,025,000)
Tax withholdings related to equity-based awards	(4,277,000)	(5,029,000)	(12,023,000)
Cash received for stock option exercises	15,000	94,000	11,000
Other financing activities	(9,000)	0	(73,000)
Cash flows provided by (used in) financing activities	(17,368,000)	(31,263,000)	(37,120,000)
Effect of exchange rate on cash flows and cash equivalents	(127,000)	0
Discontinued operations:
Cash flows provided by (used in) operating activities	0	0	5,216,000
Cash flows provided by (used in) investing activities	0	(1,153,000)	(2,302,000)
Cash flows provided by (used in) financing activities	0	0	(8,129,000)
Net increase (decrease) in cash and cash equivalents from discontinued operations	0	(1,153,000)	(5,215,000)
Net increase (decrease) in cash and cash equivalents	(26,821,000)	(231,522,000)	313,784,000
Cash and cash equivalents at beginning of period	103,134,000	334,656,000	20,872,000
Cash and cash equivalents at end of period - continuing operations	$ 76,313,000	$ 103,134,000	$ 334,656,000