Condensed Consolidated Statements of Shareholder's Equity - USD ($) $ in Thousands	Total	Common Stock	Additional Paid-in Capital	Retained Earnings	Accumulated Other Comprehensive (Loss) Income	Pension, net	Treasury Stock
Cumulative Effect on Retained Earnings, Net of Tax	$ 1,113
BALANCE, Shares at December 31, 2018 at Dec. 31, 2018		19,845,000
BALANCE at December 31, 2018 at Dec. 31, 2018	528,993	$ 212	$ 440,890	$ 232,102	$ (69,739)		$ (74,472)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net loss	(4,633)			(4,633)
Interest rate swap adjustments (1)	(2,134)
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification	(10,974)				(10,974)
Overstated (understated) comprehensive income	(10,974)
Conversion of restricted stock units (shares)		31,000
Conversion of restricted stock units	246		246
Share-based plan compensation	1,432		1,432
BALANCE, Shares at March 31, 2019 at Mar. 31, 2019		19,876,000
BALANCE at March 31, 2019 at Mar. 31, 2019	516,177	$ 212	442,568	228,582	(80,713)		(74,472)
Cumulative Effect on Retained Earnings, Net of Tax	$ (222)
BALANCE, Shares at December 31, 2018 at Dec. 31, 2019	19,845,205	19,912,000
BALANCE at December 31, 2018 at Dec. 31, 2019	$ 391,411	$ 213	446,657	99,280	(80,267)		(74,472)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net loss	(78,948)			(78,948)
Other comprehensive loss	(22,606)				(22,606)
Interest rate swap adjustments (1)	(2,320)
Overstated (understated) comprehensive income	(22,606)					$ 39
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period		3,000
Stock Issued During Period, Value, Stock Options Exercised	117		117
Conversion of restricted stock units (shares)		41,000
Conversion of restricted stock units	420		420
Share-based plan compensation	$ 673		673
BALANCE, Shares at March 31, 2019 at Mar. 29, 2020	19,953,599	19,956,000
BALANCE at March 31, 2019 at Mar. 29, 2020	$ 290,845	$ 213	$ 447,867	$ 20,110	$ (102,873)		$ (74,472)