Consolidated Statement of Stockholders' Equity - USD ($)	Total	Common Stock [Member]	Preferred Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Income (Loss) [Member]	Treasury Stock [Member]
Common stock, shares outstanding at Dec. 31, 2017		35,436,252
Balance at Dec. 31, 2017	$ 169,060,000	$ 354,000	$ 100	$ 144,650,000	$ 25,407,000	$ (1,210,000)	$ (141,000)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock-based compensation	5,812,000			5,812,000
Vesting of non-vested shares, shares		306,175
Vesting of non-vested shares	0	$ 3,000		(3,000)
Net income (loss)	10,104,000				10,104,000
Change in postretirement benefit obligations	564,000					564,000
Common stock, shares outstanding at Dec. 30, 2018		35,742,427					0
Balance at Dec. 30, 2018	185,540,000	$ 357,000	$ 100	150,459,000	35,511,000	(646,000)	$ (141,000)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Cumulative-effect adjustment from new accounting principal adoption | Accounting Standards Update 2016-02 [Member]	7,504,000				7,504,000
Stock-based compensation	5,753,000			5,753,000
Vesting of non-vested shares, shares		492,135
Vesting of non-vested shares	0	$ 4,000		(4,000)
Issuance of common and preferred stock, shares		7,364,413	10,000
Issuance of common and preferred stock	$ 145,333,000	$ 74,000		145,259,000
Treasury Stock, Shares, Acquired	553,112
Repurchase of treasury stock	$ (4,017,000)						(4,017,000)
Retirement of treasury stock	0			(141,000)			$ 141,000
Conversion of preferred stock to common stock, shares		7,450,402	(10,000)
Conversion of preferred stock to common stock	0	$ 75,000		(75,000)
Net income (loss)	(31,919,000)				(31,919,000)
Change in postretirement benefit obligations	$ 1,268,000					1,268,000
Common stock, shares outstanding at Dec. 29, 2019	50,496,265	51,049,377					553,112
Balance at Dec. 29, 2019	$ 309,462,000	$ 510,000	$ 100	301,251,000	11,096,000	622,000	$ (4,017,000)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock-based compensation	5,223,000			5,223,000
Vesting of non-vested shares, shares		436,739
Vesting of non-vested shares	$ 0	$ 5,000		(5,000)
Treasury Stock, Shares, Acquired	1,543,622
Repurchase of treasury stock	$ (10,053,000)						$ (10,053,000)
Net income (loss)	(29,463,000)				(29,463,000)
Change in Valuation of Interest Rate Swap	(4,221,000)					(4,221,000)
Change in postretirement benefit obligations	$ 584,000					584,000
Common stock, shares outstanding at Jan. 03, 2021	51,840,200	51,486,116					2,096,734
Balance at Jan. 03, 2021	$ 271,532,000	$ 515,000	$ 100	$ 306,469,000	$ (18,367,000)	$ (3,015,000)	$ (14,070,000)