CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017	Dec. 31, 2017
Cash Flows From Operating Activities
Net income	$ 4,689,000	$ 4,451,000	$ 4,385,000	$ 5,406,000
Adjustments to reconcile net (loss) income to net cash provided by operating activities:
Provision for bad debts				121,000
Depreciation and amortization			1,628,000	2,415,000
Stock-based compensation			3,615,000	5,020,000
Amortization of deferred financing costs			1,889,000	1,974,000
Income from equity method investment				(31,000)
Loss on disposal of property and equipment				2,000
Realized loss on sale of available-for-sale securities				1,916,000
Loss on sale of assets			7,117,000
Deferred income taxes			1,484,000	3,610,000
Changes in operating assets and liabilities:
Accounts receivable			4,699,000	3,843,000
Prepaid expenses and other assets			(4,790,000)	(167,000)
Accounts payable and accrued expenses			(6,240,000)	(4,569,000)
Deferred revenue			(1,696,000)	(4,267,000)
Other liabilities			4,633,000	768,000
Cash Provided By Operating Activities			16,724,000	16,041,000
Cash Flows From Investing Activities
Investments in intangible assets, including registration and renewal costs			(143,000)	(215,000)
Proceeds from sale of available-for-sale securities				5,757,000	$ 5,754,000
Purchases of property and equipment			(3,735,000)	(239,000)
Proceeds from sale of property and equipment				2,000
Proceeds from sale of trademarks			4,356,000
Cash Provided By Investing Activities			478,000	5,305,000
Cash Flows From Financing Activities
Stock registration costs				(20,000)
Payment of long-term debt			(14,756,000)	(14,150,000)
Guaranteed payments in connection with acquisitions			(1,050,000)	(1,300,000)
Repurchases of common stock			(2,002,000)	(1,064,000)
Noncontrolling interest distributions			(4,187,000)	(4,211,000)
Cash Used In Financing Activities			(21,995,000)	(20,745,000)
Net (Decrease) Increase In Cash and Restricted Cash			(4,793,000)	601,000
Cash and Restricted Cash - Beginning of period			20,433,000	20,654,000	20,654,000
Cash and Restricted Cash - End of period	$ 15,640,000	$ 21,255,000	15,640,000	21,255,000	$ 20,433,000
Supplemental Disclosures Of Cash Flow Information
Cash paid for: Interest			29,566,000	27,281,000
Cash paid for: Taxes				90,000
Non-cash Investing And Financing Activities
Accrued purchases of property and equipment at period end			303,000	593,000
Unrealized loss on available-for-sale securities during the period			228,000
Unrealized gain (loss) on interest rate cap, net during the period			$ (441,000)	$ 411,000