Segment Information - Schedule of Business Segments (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Information regarding business segments
Total operating revenues	$ 493,262	$ 330,857	$ 1,266,368	$ 928,344
Segment profit (loss)	107,233	5,555	129,707	39,531
Acquisition and related integration costs	(10,928)	(16,736)	(16,059)	(23,004)
Restructuring costs	0	(27)	0	(1,922)
Depreciation and amortization of intangible assets	(26,856)	(21,661)	(80,846)	(58,199)
Gains (losses), net on disposal of property and equipment	2,012	11	(728)	(306)
Interest expense	(21,387)	(26,537)	(70,184)	(53,476)
Defined benefit pension plan expense	(1,261)	(2,071)	(3,313)	(5,207)
Miscellaneous, net	1,488	2,042	1,050	1,611
Income (loss) from continuing operations before income taxes	86,073	(21,011)	57,260	(17,541)
Depreciation:
Total depreciation	12,568	9,833	38,315	28,458
Amortization of intangible assets:
Total amortization of intangible assets	14,288	11,828	42,531	29,741
Additions to property and equipment:
Total additions to property and equipment	10,638	11,292	39,117	42,561
Local Media
Information regarding business segments
Total operating revenues	403,769	252,392	1,002,320	692,494
Segment profit (loss)	144,561	49,678	232,798	138,180
Depreciation:
Total depreciation	10,455	8,197	32,719	24,179
Amortization of intangible assets:
Total amortization of intangible assets	9,133	7,438	28,453	16,864
Additions to property and equipment:
Total additions to property and equipment	9,134	8,460	35,351	30,351
National Media
Information regarding business segments
Total operating revenues	89,413	78,285	260,835	231,937
Segment profit (loss)	12,138	9,727	39,879	31,414
Depreciation:
Total depreciation	1,691	1,233	4,328	3,090
Amortization of intangible assets:
Total amortization of intangible assets	4,816	4,052	13,063	11,862
Additions to property and equipment:
Total additions to property and equipment	1,375	2,150	3,416	10,712
Other
Information regarding business segments
Total operating revenues	80	180	3,213	3,913
Segment profit (loss)	(1,566)	(1,270)	(1,632)	(3,188)
Depreciation:
Total depreciation	76	43	154	120
Additions to property and equipment:
Total additions to property and equipment	51	308	56	518
Shared services and corporate
Information regarding business segments
Segment profit (loss)	(12,128)	(14,167)	(43,705)	(43,444)
Depreciation:
Total depreciation	346	360	1,114	1,069
Amortization of intangible assets:
Total amortization of intangible assets	339	338	1,015	1,015
Additions to property and equipment:
Total additions to property and equipment	$ 78	$ 374	$ 294	$ 980