Consolidated Statements of Shareholders' Equity - USD ($) $ in Thousands	Total	Cumulative Effect, Period of Adoption, Adjustment	Common Stock	Additional Paid-in Capital	Accumulated Other Comprehensive Income (Loss)	Retained Earnings (Accumulated Deficit)	Retained Earnings (Accumulated Deficit) Cumulative Effect, Period of Adoption, Adjustment
Beginning Balance, Shares at Jan. 01, 2019			37,305,342
Beginning Balance at Jan. 01, 2019	$ 422,274	$ 1,912	$ 4	$ 336,941	$ 180	$ 85,149	$ 1,912
Net income (loss)	1,425					1,425
Other comprehensive income (loss), net of tax	(118)				(118)
Comprehensive income (loss)	1,307
Stock-based compensation	1,577			1,577
Issuance of vested restricted stock, net of shares withheld for tax withholding, shares			13,172
Issuance of vested restricted stock, net of shares withheld for tax withholding	(84)			(84)
Exercise of stock options, shares			1,500
Exercise of stock options	16			16
Repurchase of common stocks and warrants, shares			(270,874)
Repurchase of common stocks and warrants	(4,306)			(4,306)
Ending Balance, Shares at Mar. 26, 2019			37,049,140
Ending Balance at Mar. 26, 2019	422,696		$ 4	334,144	62	88,486
Beginning Balance, Shares at Jan. 01, 2019			37,305,342
Beginning Balance at Jan. 01, 2019	422,274	$ 1,912	$ 4	336,941	180	85,149	$ 1,912
Net income (loss)	(4,152)
Other comprehensive income (loss), net of tax	(266)
Comprehensive income (loss)	(4,418)
Ending Balance, Shares at Sep. 10, 2019			37,059,202
Ending Balance at Sep. 10, 2019	414,514		$ 4	331,687	(86)	82,909
Beginning Balance, Shares at Mar. 26, 2019			37,049,140
Beginning Balance at Mar. 26, 2019	422,696		$ 4	334,144	62	88,486
Net income (loss)	2,092					2,092
Other comprehensive income (loss), net of tax	(105)				(105)
Comprehensive income (loss)	1,987
Stock-based compensation	1,677			1,677
Issuance of vested restricted stock, net of shares withheld for tax withholding, shares			48,499
Exercise of stock options, shares			1,500
Exercise of stock options	15			15
Repurchase of common stocks and warrants, shares			(303,607)
Repurchase of common stocks and warrants	(3,067)			(3,067)
Ending Balance, Shares at Jun. 18, 2019			36,795,532
Ending Balance at Jun. 18, 2019	423,308		$ 4	332,769	(43)	90,578
Net income (loss)	(7,669)					(7,669)
Other comprehensive income (loss), net of tax	(43)				(43)
Comprehensive income (loss)	(7,712)
Stock-based compensation	1,347			1,347
Issuance of vested restricted stock, net of shares withheld for tax withholding, shares			254,670
Issuance of vested restricted stock, net of shares withheld for tax withholding	(2,518)			(2,518)
Exercise of stock options, shares			9,000
Exercise of stock options	89			89
Ending Balance, Shares at Sep. 10, 2019			37,059,202
Ending Balance at Sep. 10, 2019	414,514		$ 4	331,687	(86)	82,909
Beginning Balance, Shares at Dec. 31, 2019			37,059,202
Beginning Balance at Dec. 31, 2019	302,107		$ 4	333,379	(52)	(31,224)
Net income (loss)	(102,468)					(102,468)
Other comprehensive income (loss), net of tax	45				45
Comprehensive income (loss)	(102,423)
Stock-based compensation	1,225			1,225
Issuance of vested restricted stock, net of shares withheld for tax withholding, shares			21,758
Issuance of vested restricted stock, net of shares withheld for tax withholding	(105)			(105)
Ending Balance, Shares at Mar. 24, 2020			37,080,960
Ending Balance at Mar. 24, 2020	200,804		$ 4	334,499	(7)	(133,692)
Beginning Balance, Shares at Dec. 31, 2019			37,059,202
Beginning Balance at Dec. 31, 2019	302,107		$ 4	333,379	(52)	(31,224)
Net income (loss)	(97,247)
Other comprehensive income (loss), net of tax	52
Comprehensive income (loss)	(97,195)
Ending Balance, Shares at Sep. 08, 2020			37,324,593
Ending Balance at Sep. 08, 2020	207,818		$ 4	336,285		(128,471)
Beginning Balance, Shares at Mar. 24, 2020			37,080,960
Beginning Balance at Mar. 24, 2020	200,804		$ 4	334,499	(7)	(133,692)
Net income (loss)	(576)					(576)
Other comprehensive income (loss), net of tax	7				7
Comprehensive income (loss)	(569)
Stock-based compensation	1,413			1,413
Issuance of vested restricted stock, net of shares withheld for tax withholding, shares			42,016
Ending Balance, Shares at Jun. 16, 2020			37,122,976
Ending Balance at Jun. 16, 2020	201,648		$ 4	335,912	$ 0	(134,268)
Net income (loss)	5,797					5,797
Other comprehensive income (loss), net of tax	0
Comprehensive income (loss)	5,797
Stock-based compensation	1,267			1,267
Issuance of vested restricted stock, net of shares withheld for tax withholding, shares			201,617
Issuance of vested restricted stock, net of shares withheld for tax withholding	(894)			(894)
Ending Balance, Shares at Sep. 08, 2020			37,324,593
Ending Balance at Sep. 08, 2020	$ 207,818		$ 4	$ 336,285		$ (128,471)