Computation of Earnings Per Share - Schedule of Earnings Per Share, Basic and Diluted (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 27, 2019	Sep. 28, 2018	Sep. 27, 2019	Sep. 28, 2018
Earnings Per Share Reconciliation [Abstract]
Earnings from continuing operations	$ 10,130	$ (9,503)	$ 22,341	$ 245
Earnings from discontinued operations, net of tax	132,646	10,935	148,026	30,347
Net earnings	$ 142,776	$ 1,432	$ 170,367	$ 30,592
Basic:
Weighted average number of shares outstanding (in shares)	27,952	28,009	27,941	27,944
Basic earnings per share from continuing operations	$ 0.36	$ (0.34)	$ 0.80	$ 0.01
Income (Loss) from Discontinued Operations and Disposal of Discontinued Operations, Net of Tax, Per Basic Share	4.75	0.39	5.30	1.08
Basic earnings per share (in usd per share)	$ 5.11	$ 0.05	$ 6.10	$ 1.09
Diluted:
Weighted average shares issuable on exercise of dilutive stock options (in shares)	165	208	163	222
Incremental Common Shares Attributable to Dilutive Effect of Conversion of Debt Securities	0	41	0	49
Weighted average shares issuable on redemption of warrants related to the 2017 Notes (in shares)	0	0	0	43
Diluted (in shares)	28,117	28,258	28,104	28,258
Diluted earnings per share from continuing operations	$ 0.36	$ (0.34)	$ 0.79	$ 0.01
Income (Loss) from Discontinued Operations and Disposal of Discontinued Operations, Net of Tax, Per Diluted Share	4.72	0.39	5.27	1.07
Diluted earnings per share (in usd per share)	$ 5.08	$ 0.05	$ 6.06	$ 1.08