CONDENSED CONSOLIDATED BALANCE SHEETS (Unaudited) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Current assets:
Cash and cash equivalents	$ 58,663	$ 73,411
Accounts receivable, net of allowance for doubtful accounts of $1,692 in 2017 and $1,781 in 2016	89,228	74,416
Inventories	102,992	98,871
Other current assets	10,500	8,744
Total current assets	261,383	255,442
Property, plant and equipment, net	44,947	48,755
Intangible assets, net	72,108	74,828
Goodwill	19,358	17,951
Deferred income taxes	4,262	3,410
Other assets	27,881	26,354
Total assets	429,939	426,740
Current liabilities:
Accounts payable	48,821	47,235
Accrued expenses	29,167	31,549
Current portion of long-term debt	14,440	11,395
Other current liabilities	5,074	2,148
Total current liabilities	97,502	92,327
Long-term liabilities:
Long-term debt	116,075	129,850
Liability for uncertain tax positions	27,339	27,458
Minimum pension obligation and unfunded pension liability	17,498	16,900
Deferred income taxes	1,597	1,460
Other liabilities	305	311
Total liabilities	260,316	268,306
Commitments and contingencies
Stockholders' Equity:
Preferred stock, no par value, 1,000,000 shares authorized; none issued	0	0
Additional paid-in capital	27,089	27,242
Retained earnings	165,200	161,287
Accumulated other comprehensive loss	(23,870)	(31,297)
Total stockholders' equity	169,623	158,434
Total liabilities and stockholders' equity	429,939	426,740
Class A Common Stock [Member]
Stockholders' Equity:
Common Stock	217	217
Class B Common Stock [Member]
Stockholders' Equity:
Common Stock	$ 987	$ 985