Consolidated Statements of Cash Flows - USD ($)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Cash flows from operating activities:
Controlling interests	$ (11,185,000)	$ 23,059,000	$ 9,830,000
Noncontrolling interests	912,000	234,000	416,000
Net income (loss)	(10,273,000)	23,293,000	10,246,000
Adjustments to reconcile net income (loss) to net cash from operating activities:
Depreciation and amortization	25,683,000	23,971,000	17,577,000
Amortization of deferred financing costs	1,646,000	1,579,000	1,720,000
Deferred income tax expense (benefit)	(13,806,000)	15,831,000	7,737,000
Provision for doubtful accounts	2,186,000	1,921,000	1,170,000
Stock-based compensation expense	748,000	4,253,000	4,278,000
Trade activity, net	(11,754,000)	(9,731,000)	(5,357,000)
Repurchase of debt	0	(546,000)	0
Amortization of bond premium	0	0	(424,000)
Write-off deferred financing costs	83,000	376,000	9,348,000
Write-off of bond premium	0	0	(6,779,000)
Impairment of goodwill	48,933,000	0	0
Impairment of FCC licenses	2,915,000	0	1,680,000
Write-off of goodwill	4,105,000	0	0
Write-off of trademark	771,000	0	0
Impairment on investment	0	4,236,000	0
Net (gain) loss on sale and retirement of assets	397,000	282,000	(12,029,000)
Changes in assets and liabilities, net of acquisitions:
Accounts receivable	(864,000)	3,987,000	3,342,000
Prepaid expenses and other assets	(676,000)	(704,000)	(6,805,000)
Accounts payable	669,000	(2,463,000)	33,000
Accrued expenses	(625,000)	(5,002,000)	1,657,000
Accrued interest	1,107,000	(288,000)	(4,335,000)
Other long-term liabilities	(835,000)	(1,074,000)	2,884,000
Net cash provided by operating activities - continuing operations	50,410,000	59,921,000	25,943,000
Net cash (used in) provided by operating activities - discontinued operations	274,000	(124,000)	0
Net cash provided by operating activities	50,684,000	59,797,000	25,943,000
Cash flows from investing activities:
Payments for acquisitions, net of cash received	(5,511,000)	(2,160,000)	(76,213,000)
Payment for investment	(857,000)	0	0
Acquisition of intangibles	(150,000)	(11,000)	(377,000)
Purchase of property and equipment	(22,824,000)	(20,722,000)	(14,724,000)
Proceeds from insurance settlement	0	451,000	450,000
Proceeds from sale of assets	1,092,000	1,678,000	19,087,000
Net cash used in investing activities - continuing operations	(28,250,000)	(20,764,000)	(71,777,000)
Net cash used in investing activities - discontinued operations	(680,000)	(199,000)	0
Net cash used in investing activities	(28,930,000)	(20,963,000)	(71,777,000)
Cash flows from financing activities:
Offering costs	0	0	(92,000)
Proceeds from exercise of employee stock options	346,000	0	72,000
Repayment of long-term debt	(6,662,000)	(19,375,000)	(553,552,000)
Proceeds from the issuance of long-term debt	0	0	620,000,000
Debt financing costs	(526,000)	0	(11,394,000)
Proceeds from sale of noncontrolling interest in subsidiary	0	50,000	0
Cash distributions to noncontrolling interests	(496,000)	(219,000)	(444,000)
Repayments of capitalized obligations	(616,000)	(171,000)	(159,000)
Net cash provided by (used in) financing activities - continuing operations	(7,954,000)	(19,715,000)	54,431,000
Net effect of foreign currency exchange rate changes	(45,000)	(877,000)	239,000
Net increase in cash and restricted cash	13,755,000	18,242,000	8,836,000
Cash, Beginning of period	51,540,000	33,298,000	24,462,000
Cash, End of period	$ 65,295,000	$ 51,540,000	$ 33,298,000