Income (Loss) Per Share (Computation of Basic and Diluted Income (Loss) per Share) (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Oct. 01, 2016	Sep. 30, 2017	Oct. 01, 2016
Earnings Per Share [Abstract]
(Loss) income from continuing operations	$ (19,443)	$ 8,059	$ (28,922)	$ 65,147
(Loss) income from discontinued operations, net of taxes	(8,607)	1,372	(9,671)	3,043
Net (loss) income	(28,050)	9,431	(38,593)	68,190
Interest expense on 7% Notes, net of taxes	0	211	0	1,521
(Loss) income from continuing operations - after assumed conversions of dilutive shares	(19,443)	8,270	(28,922)	66,668
Net (loss) income for diluted loss per share - after assumed conversions of dilutive shares	$ (28,050)	$ 9,642	$ (38,593)	$ 69,711
Weighted Average Number of Shares Outstanding Reconciliation [Abstract]
Basic shares	8,578	8,552	8,564	8,518
Dilutive effect of 7% Notes (shares)	0	415	0	1,227
Dilutive effect of Equity Awards (shares)	0	0	0	0
Dilutive effect of warrants (shares)	0	0	0	0
Diluted shares	8,578	8,967	8,564	9,745
(Loss) income per share – basic:
Continuing operations per share - basic	$ (2.27)	$ 0.94	$ (3.38)	$ 7.65
Discontinued operations per share - basic	(1.00)	0.16	(1.13)	0.36
Net (loss) income per share - basic	(3.27)	1.10	(4.51)	8.01
(Loss) income per share – diluted:
Continuing operations per share - diluted	(2.27)	0.92	(3.38)	6.84
Discontinued operations per share - diluted	(1.00)	0.16	(1.13)	0.31
Net (loss) income per share - diluted	$ (3.27)	$ 1.08	$ (4.51)	$ 7.15