Restatement of Previously Issued Consolidated Financial Statements - Effect of The Error Correction On The Company’s Consolidated Balance Sheet (Details) - USD ($) $ / shares in Units, $ in Thousands	Mar. 31, 2020	Dec. 31, 2019	Mar. 31, 2019	Dec. 31, 2018
Current Assets:
Cash	$ 58,055	$ 39,511
Accounts receivable, net of allowances	123,293	115,099
Inventories	84,459	82,872
Other current assets	14,043	18,490
Total current assets	279,850	255,972
Property, plant and equipment, net	70,022	73,686
Operating lease right-of-use assets, net	31,645	34,960
Goodwill	0	27,816		$ 7,576
Deferred income taxes	22,795	14,654
Other assets, net	2,716	3,480
Total assets	431,188	435,826
Current Liabilities:
Accounts payable	73,640	63,058
Current operating lease liabilities	7,730	7,620
Accrued liabilities and other	39,266	32,673
Current portion of long-term debt	3,268	3,256
Total current liabilities	138,904	106,607
Long-term debt	152,304	153,128
Operating lease liabilities	26,248	29,414
Pension and other post-retirement liabilities	10,072	10,666
Other long-term liabilities	6,734	7,323
Total liabilities	334,262	307,138
Stockholders’ Equity:
Preferred stock, $.01 par value (5,000,000 shares authorized; no shares issued and outstanding)	0	0
Common stock, $.01 par value (60,000,000 shares authorized; 30,512,843 shares issued and outstanding)	323	323
Treasury stock, at cost: 1,334,251 shares	(11,230)	(11,230)
Additional paid-in capital	246,714	245,852
Retained deficit	(84,901)	(60,307)
Accumulated other comprehensive loss	(53,980)	(45,950)
Total stockholders’ equity	96,926	128,688	$ 120,065	$ 109,596
Total liabilities and stockholders’ equity	$ 431,188	$ 435,826
Preferred stock, par value (in dollars per share)	$ 0.01	$ 0.01	$ 0.01
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01	$ 0.01