Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Current assets
Cash and cash equivalents	$ 77,056	$ 81,157
Accounts receivable, net of allowances of $8,934 and $8,405, respectively	77,182	63,437
Inventories	77,686	81,330
Prepaid expenses and other current assets	31,219	25,877
Total current assets	263,143	251,801
Property, plant and equipment, net	43,973	45,139
Patents and other intangible assets, net	13,150	10,461
Goodwill	53,565	53,565
Deferred income taxes	28,359	23,315
Other long-term assets	6,814	21,073
Total assets	409,004	405,354
Current liabilities
Accounts payable	14,012	18,111
Other current liabilities	51,171	61,295
Total current liabilities	65,183	79,406
Other long-term liabilities	30,647	29,340
Total liabilities	95,830	108,746
Contingencies (Note 5)
Shareholders’ equity
Common shares $0.10 par value; 50,000,000 shares authorized; 18,405,344 and 18,278,833 issued and outstanding as of March 31, 2018 and December 31, 2017, respectively	1,841	1,828
Additional paid-in capital	228,356	220,591
Retained earnings	78,493	70,402
Accumulated other comprehensive income	4,484	3,787
Total shareholders’ equity	313,174	296,608
Total liabilities and shareholders’ equity	$ 409,004	$ 405,354