Consolidated Statement of Stockholders' Equity - USD ($) $ in Thousands	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 Jan. 01, 2017		35,258,579
Balance at Jan. 01, 2017	$ 154,656	$ 353	$ 100	$ 141,133	$ 14,514	$ (1,203)	$ (141)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock-based compensation	3,518			3,518
Vesting of non-vested shares, shares		177,673
Vesting of non-vested shares	0	$ 1		(1)
Net income (loss)	7,159				7,159
Change in postretirement benefit obligations	(7)					(7)
Common stock, shares outstanding at Dec. 31, 2017		35,436,252
Balance at Dec. 31, 2017	169,060	$ 354	100	144,650	25,407	(1,210)	(141)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock-based compensation	5,812			5,812
Vesting of non-vested shares, shares		306,175
Vesting of non-vested shares	0	$ 3		(3)
Net income (loss)	10,104				10,104
Change in postretirement benefit obligations	$ 564					564
Common stock, shares outstanding at Dec. 30, 2018	35,742,427	35,742,427
Balance at Dec. 30, 2018	$ 185,540	$ 357	$ 100	150,459	35,511	(646)	(141)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock-based compensation	5,753			5,753
Vesting of non-vested shares, shares		492,135
Vesting of non-vested shares	0	$ 4		(4)
Issuance of common and preferred stock, shares		7,364,413	10,000,000
Issuance of common and preferred stock	145,333	$ 74		145,259
Repurchase of treasury stock	(4,017)						(4,017)
Retirement of treasury stock	0			(141)			141
Conversion of preferred stock to common stock, shares		7,450,402	(10,000,000)
Conversion of preferred stock to common stock	0	$ 75		(75)
Net income (loss)	(31,919)				(31,919)
Change in postretirement benefit obligations	$ 1,268					1,268
Common stock, shares outstanding at Dec. 29, 2019	51,049,377	51,049,377
Balance at Dec. 29, 2019	$ 309,462	$ 510	$ 100	$ 301,251	$ 11,096	$ 622	$ (4,017)