Consolidated Statements of Operations - USD ($)	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Income Statement [Abstract]
Net sales	$ 146,195,000	$ 151,843,000
Costs and expenses
Cost of sales, excluding publishing rights and pre-publication amortization	58,137,000	63,652,000
Publishing rights amortization	3,166,000	4,432,000
Pre-publication amortization	25,051,000	30,562,000
Cost of sales	86,354,000	98,646,000
Selling and administrative	89,235,000	123,341,000
Other intangible assets amortization	7,906,000	5,856,000
Impairment charge for goodwill	0	262,000,000
Operating loss	(37,300,000)	(338,000,000)
Other income (expense)
Retirement benefits non-service (expense) income	(200,000)	61,000
Interest expense	(8,564,000)	(9,253,000)
Interest income	20,000	766,000
Change in fair value of derivative instruments	(674,000)	(380,000)
Loss from continuing operations before taxes	(46,718,000)	(346,806,000)
Income tax expense (benefit) for continuing operations	2,310,000	(8,780,000)
Loss from continuing operations	(49,028,000)	(338,026,000)
Loss from discontinued operations, net of tax	(2,955,000)	(7,947,000)
Net loss	$ (51,983,000)	$ (345,973,000)
Net loss per share attributable to common stockholders
Continuing operations	$ (0.39)	$ (2.71)
Discontinued operations	(0.02)	(0.06)
Net loss	$ (0.41)	$ (2.77)
Weighted average shares outstanding
Basic and diluted	126,473,317	124,688,974