Segment Information - Schedule of Business Segments (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Information regarding business segments
Total operating revenues	$ 349,777	$ 302,726	$ 979,435	$ 840,312
Segment profit (loss)	498	40,325	22,810	62,166
Acquisition and related integration costs	(16,736)	(332)	(23,004)	(332)
Restructuring costs	(27)	(863)	(1,922)	(7,000)
Depreciation and amortization of intangible assets	(22,241)	(15,598)	(60,270)	(46,400)
Gains (losses), net on disposal of property and equipment	11	501	(306)	(150)
Interest expense	(26,537)	(9,003)	(53,476)	(27,041)
Defined benefit pension plan expense	(2,071)	(3,529)	(5,207)	(6,306)
Miscellaneous, net	2,042	(546)	1,611	(535)
Income (loss) from continuing operations before income taxes	(26,068)	27,247	(34,262)	28,284
Depreciation:
Total depreciation	10,020	8,627	28,990	24,616
Amortization of intangible assets:
Total amortization of intangible assets	12,221	6,971	31,280	21,784
Additions to property and equipment:
Total additions to property and equipment	11,326	13,781	42,669	39,692
Local Media
Information regarding business segments
Total operating revenues	252,392	230,734	692,494	636,041
Segment profit (loss)	49,678	67,416	138,180	152,403
Depreciation:
Total depreciation	8,197	8,004	24,179	22,891
Amortization of intangible assets:
Total amortization of intangible assets	7,438	3,706	16,864	11,116
Additions to property and equipment:
Total additions to property and equipment	8,460	8,156	30,351	28,269
National Media
Information regarding business segments
Total operating revenues	97,205	71,761	283,028	200,708
Segment profit (loss)	5,250	2,838	16,764	6,910
Depreciation:
Total depreciation	1,420	273	3,622	503
Amortization of intangible assets:
Total amortization of intangible assets	4,445	2,927	13,401	9,653
Additions to property and equipment:
Total additions to property and equipment	2,184	5,625	10,820	11,350
Other
Information regarding business segments
Total operating revenues	180	231	3,913	3,563
Segment profit (loss)	(1,270)	(1,267)	(3,188)	(3,161)
Depreciation:
Total depreciation	43	37	120	113
Additions to property and equipment:
Total additions to property and equipment	308	0	518	0
Shared services and corporate
Information regarding business segments
Segment profit (loss)	(14,167)	(12,370)	(43,444)	(40,104)
Depreciation:
Total depreciation	360	313	1,069	1,109
Amortization of intangible assets:
Total amortization of intangible assets	338	338	1,015	1,015
Additions to property and equipment:
Total additions to property and equipment	$ 374	$ 0	$ 980	$ 73