Consolidated Statements of Operations - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Income Statement [Abstract]
Revenues	$ 687,961	$ 708,993	$ 784,459
Cost of Goods and Services Sold	464,470	472,375	538,877
Program inventory impairment	44,542	0	0
Gross profit	178,949	236,618	245,582
Selling, general and administrative expenses	166,447	152,474	169,485
Goodwill and Intangible Asset Impairment	25,306	0	50,307
Impairment of Long-Lived Assets to be Disposed of	0	0	36,285
Program contract costs impairment	9,135	0	0
Research and development costs	19,552	16,072	14,755
Intangible assets amortization expense	15,331	10,468	15,666
Costs of Transition Services Agreement	0	1,728	12,515
Cost of Acquired Retention Plans [Line Items]	0	0	22,814
Restructuring and severance costs (Note 5)	9,842	6,154	8,359
Gain (Loss) on Disposition of Business	(457)	234	(493)
Net loss (gain) on sale of assets	136	(8)	200
Operating (loss) income	(66,343)	49,496	(84,311)
Interest expense, net	16,874	16,290	19,270
Net Periodic Defined Benefits Expense (Reversal of Expense), Excluding Service Cost Component	(20,574)	(26,229)	(16,250)
Income from transition services agreement	0	(931)	(8,439)
Other expense (income), net	315	(142)	(728)
(Loss) earnings from continuing operations before income taxes	(62,958)	60,508	(78,164)
Income tax (benefit) expense	(16,732)	16,832	(7,730)
Net earnings	(46,226)	43,676	(70,434)
Discontinued Operation, Income (Loss) from Discontinued Operation During Phase-out Period, Net of Tax	0	0	0
Discontinued Operation, Gain (Loss) on Disposal of Discontinued Operation, Net of Tax	0	0	692
Income (Loss) from Discontinued Operations, Net of Tax, Attributable to Parent	0	0	692
Net earnings	$ (46,226)	$ 43,676	$ (69,742)
Earnings per share:
Income (Loss) from Continuing Operations, Per Basic Share	$ (1.65)	$ 1.57	$ (2.54)
Income (Loss) from Discontinued Operations and Disposal of Discontinued Operations, Net of Tax, Per Basic Share	0.00	0.00	0.02
Earnings Per Share, Basic (in dollars per share)	(1.65)	1.57	(2.52)
Income (Loss) from Continuing Operations, Per Diluted Share	(1.65)	1.57	(2.54)
Income (Loss) from Discontinued Operations and Disposal of Discontinued Operations, Net of Tax, Per Diluted Share	0.00	0.00	0.02
Diluted earnings per share (in dollars per share)	$ (1.65)	$ 1.57	$ (2.52)
Basic:
Basic (in shares)	28,011	27,865	27,723
Diluted(1):
Diluted (in shares)	28,011	27,891	27,723