CONDENSED CONSOLIDATED BALANCE SHEETS (Unaudited) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Current Assets:
Cash and cash equivalents	$ 58,395	$ 53,911
Accounts receivable, net of allowance for doubtful accounts of $1,694 and $1,638, respectively	84,248	91,939
Inventories	118,209	120,068
Unbilled receivables	11,470	15,799
Other current assets	9,090	8,792
Total current assets	281,412	290,509
Property, plant and equipment, net	42,344	43,932
Right-of-use assets	17,885	0
Intangible assets, net	59,476	62,689
Goodwill	20,017	19,817
Deferred income taxes	1,194	496
Other assets	27,347	26,081
Total assets	449,675	443,524
Current Liabilities:
Accounts payable	42,764	56,171
Accrued expenses	30,092	32,290
Current portion of long-term debt	3,997	2,508
Operating lease liability, current	6,238	0
Other current liabilities	4,060	15,061
Total current liabilities	87,151	106,030
Long-term Liabilities:
Long-term debt	108,960	111,705
Operating lease liability, long-term	12,121	0
Liability for uncertain tax positions	28,379	27,553
Minimum pension obligation and unfunded pension liability	19,126	18,683
Deferred income taxes	1,061	1,161
Other liabilities	12,601	1,922
Total liabilities	269,399	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	32,983	31,387
Retained earnings	171,583	168,695
Accumulated other comprehensive loss	(25,521)	(24,838)
Total stockholders' equity	180,276	176,470
Total liabilities and stockholders' equity	449,675	443,524
Class A Common Stock [Member]
Stockholders' Equity:
Common Stock	217	217
Class B Common Stock [Member]
Stockholders' Equity:
Common Stock	$ 1,014	$ 1,009