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		6 Months Ended
	Jun. 28, 2019	Jun. 29, 2018	Jun. 28, 2019	Jun. 29, 2018
Earnings Per Share Reconciliation [Abstract]
Earnings from continuing operations	$ 6,389	$ 4,778	$ 12,211	$ 9,748
Earnings from discontinued operations, net of tax	7,077	10,316	15,380	19,412
Net earnings	$ 13,466	$ 15,094	$ 27,591	$ 29,160
Basic:
Weighted average number of shares outstanding (in shares)	27,961	27,971	27,935	27,911
Basic earnings per share from continuing operations	$ 0.23	$ 0.17	$ 0.44	$ 0.35
Basic earnings per share from discontinued operations	0.25	0.37	0.55	0.69
Basic earnings per share (in usd per share)	$ 0.48	$ 0.54	$ 0.99	$ 1.04
Diluted:
Weighted average shares issuable on exercise of dilutive stock options (in shares)	162	237	162	228
Incremental Common Shares Attributable to Dilutive Effect of Conversion of Debt Securities	0	108	0	54
Weighted average shares issuable on redemption of warrants related to the 2017 Notes (in shares)	0	33	0	65
Diluted (in shares)	28,123	28,349	28,097	28,258
Diluted earnings per share from continuing operations	$ 0.23	$ 0.17	$ 0.43	$ 0.34
Diluted earnings per share from discontinued operations	0.25	0.36	0.55	0.69
Diluted earnings per share (in usd per share)	$ 0.48	$ 0.53	$ 0.98	$ 1.03