Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020	Mar. 31, 2020
Current assets
Cash and cash equivalents	$ 257,428	$ 274,639	$ 301,741
Trade accounts receivable, net	227,201	165,128	168,736
Inventories	296,640	283,742	255,720
Other current assets	37,732	29,630	25,786
Total current assets	819,001	753,139	751,983
Property, plant and equipment, net	255,684	255,184	246,941
Operating lease right-of-use assets	44,236	45,792	33,725
Goodwill	133,477	135,844	131,599
Intangible assets, net	25,059	26,800	23,454
Other noncurrent assets	17,270	15,810	10,546
Total Assets	1,294,727	1,232,569	1,198,248
Current liabilities
Trade accounts payable	66,236	48,271	44,505
Accrued liabilities and other current liabilities	158,578	145,790	118,346
Total current liabilities	224,814	194,061	162,851
Operating lease liabilities	35,810	37,199	26,084
Long term debt, net of current portion	0	0	150,000
Deferred income tax and other long-term liabilities	19,594	20,366	17,719
Total liabilities	280,218	251,626	356,654
Commitments and contingencies (see Note 13)
Stockholders’ equity
Common stock, at par value	435	433	444
Additional paid-in capital	285,896	284,007	272,872
Retained earnings	760,862	720,441	672,485
Treasury stock	(13,510)	(13,510)	(72,058)
Accumulated other comprehensive loss	(19,174)	(10,428)	(32,149)
Total stockholders’ equity	1,014,509	980,943	841,594
Total liabilities and stockholders’ equity	$ 1,294,727	$ 1,232,569	$ 1,198,248