Consolidated Statements of Operations - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Income Statement [Abstract]
Revenues	$ 761,608	$ 735,994	$ 724,944
Cost of Goods and Services Sold	520,803	508,677	490,915
Gross profit	240,805	227,317	234,029
Selling, general and administrative expenses	177,187	172,271	169,683
Impairment of Intangible Assets, Finite-lived	0	10,039	0
Costs of Transition Services Agreement	4,673	0	0
Restructuring costs (Note 5)	1,558	7,353	2,661
Gain (Loss) on Disposition of Business	3,739	5,722	0
Net loss (gain) on sale of assets	237	(1,031)	(31)
Operating income	53,411	32,963	61,716
Interest expense, net	17,202	20,046	20,578
Net Periodic Defined Benefits Expense (Reversal of Expense), Excluding Service Cost Component	(396)	(12,127)	(3,056)
Income from transition services agreement	3,673	0	0
Other income, net	(309)	(92)	(728)
Earnings from continuing operations before income taxes	40,587	25,136	44,922
Income tax (benefit) expense	(15,859)	9,259	25,214
Net earnings	56,446	15,877	19,708
Discontinued Operation, Income (Loss) from Discontinued Operation During Phase-out Period, Net of Tax	29,027	38,292	30,118
Discontinued Operation, Gain (Loss) on Disposal of Discontinued Operation, Net of Tax	124,356	0	0
Income (Loss) from Discontinued Operations, Net of Tax, Attributable to Parent	153,383	38,292	30,118
Net earnings	$ 209,829	$ 54,169	$ 49,826
Income (Loss) from Continuing Operations, Per Basic Share	$ 2.02	$ 0.57	$ 0.71
Income (Loss) from Discontinued Operations and Disposal of Discontinued Operations, Net of Tax, Per Basic Share	5.49	1.37	1.09
Earnings per share:
Earnings Per Share, Basic (in dollars per share)	7.51	1.94	1.80
Income (Loss) from Continuing Operations, Per Diluted Share	2.01	0.56	0.69
Income (Loss) from Discontinued Operations and Disposal of Discontinued Operations, Net of Tax, Per Basic and Diluted Share	5.46	1.36	1.06
Diluted earnings per share (in dollars per share)	$ 7.47	$ 1.92	$ 1.75
Weighted average shares outstanding:
Basic (in shares)	27,936	27,945	27,611
Diluted (in shares)	28,092	28,223	28,418