Segment Information - Schedule of Business Segments (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Information regarding business segments
Total operating revenues	$ 358,883	$ 320,428	$ 773,106	$ 597,487
Segment profit (loss)	1,550	28,401	22,474	33,976
Acquisition and related integration costs	(221)	(2,788)	(5,131)	(6,268)
Restructuring costs	0	(957)	0	(1,895)
Depreciation and amortization of intangible assets	(26,645)	(19,532)	(53,990)	(36,538)
Gains (losses), net on disposal of property and equipment	(1,307)	(144)	(2,740)	(317)
Interest expense	(22,999)	(18,023)	(48,797)	(26,939)
Defined benefit pension plan expense	(1,026)	(1,564)	(2,052)	(3,136)
Miscellaneous, net	(1,552)	369	(438)	(431)
Income (loss) from continuing operations before income taxes	(24,027)	9,183	(28,813)	3,470
Depreciation:
Total depreciation	12,396	9,827	25,747	18,625
Amortization of intangible assets:
Total amortization of intangible assets	14,249	9,705	28,243	17,913
Additions to property and equipment:
Total additions to property and equipment	12,110	17,064	28,479	31,269
Local Media
Information regarding business segments
Total operating revenues	276,747	236,715	598,551	440,102
Segment profit (loss)	32,260	54,329	88,237	88,502
Depreciation:
Total depreciation	10,774	8,391	22,264	15,982
Amortization of intangible assets:
Total amortization of intangible assets	9,399	5,468	19,320	9,426
Additions to property and equipment:
Total additions to property and equipment	11,776	12,411	26,217	21,891
National Media
Information regarding business segments
Total operating revenues	80,503	81,439	171,422	153,652
Segment profit (loss)	10,282	12,097	27,741	21,687
Depreciation:
Total depreciation	1,194	1,030	2,637	1,857
Amortization of intangible assets:
Total amortization of intangible assets	4,512	3,898	8,247	7,810
Additions to property and equipment:
Total additions to property and equipment	232	4,279	2,041	8,562
Other
Information regarding business segments
Total operating revenues	1,633	2,274	3,133	3,733
Segment profit (loss)	104	(1,485)	(66)	(1,918)
Depreciation:
Total depreciation	41	39	78	77
Additions to property and equipment:
Total additions to property and equipment	0	179	5	210
Shared services and corporate
Information regarding business segments
Segment profit (loss)	(12,923)	(13,119)	(31,577)	(29,277)
Depreciation:
Total depreciation	387	367	768	709
Amortization of intangible assets:
Total amortization of intangible assets	338	339	676	677
Additions to property and equipment:
Total additions to property and equipment	$ 102	$ 195	$ 216	$ 606