CONDENSED CONSOLIDATED BALANCE SHEETS (Unaudited) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Current Assets:
Cash and cash equivalents	$ 43,191	$ 53,911
Accounts receivable, net of allowance for doubtful accounts of $1,700 in 2019 and $1,638 in 2018	94,229	91,939
Inventories	124,785	120,068
Unbilled receivables	10,230	15,799
Assets held for sale	1,518	0
Other current assets	9,309	8,792
Total current assets	283,262	290,509
Property, plant and equipment, net	41,864	43,932
Right-of-use assets	19,022	0
Intangible assets, net	61,267	62,689
Goodwill	20,070	19,817
Deferred income taxes	1,304	496
Other assets	27,451	26,081
Total assets	454,240	443,524
Current Liabilities:
Accounts payable	48,126	56,171
Accrued expenses	27,218	32,290
Current portion of long-term debt	3,252	2,508
Operating lease liability, current	6,243	0
Other current liabilities	5,846	15,061
Total current liabilities	90,685	106,030
Long-term Liabilities:
Long-term debt	110,333	111,705
Operating lease liability, long-term	13,044	0
Liability for uncertain tax positions	28,272	27,553
Minimum pension obligation and unfunded pension liability	18,907	18,683
Deferred income taxes	1,201	1,161
Other liabilities	13,645	1,922
Total liabilities	276,087	267,054
Commitments and contingencies
Stockholders' Equity:
Preferred stock, no par value, 1,000,000 shares authorized; none issued	0	0
Additional paid-in capital	32,201	31,387
Retained earnings	169,451	168,695
Accumulated other comprehensive loss	(24,724)	(24,838)
Total stockholders' equity	178,153	176,470
Total liabilities and stockholders' equity	454,240	443,524
Class A Common Stock [Member]
Stockholders' Equity:
Common Stock	217	217
Class B Common Stock [Member]
Stockholders' Equity:
Common Stock	$ 1,008	$ 1,009