Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018	Jun. 30, 2018
Current assets
Cash and cash equivalents	$ 141,731	$ 160,180	$ 155,035
Trade accounts receivable, net	191,282	146,052	211,179
Inventories	266,142	276,088	258,180
Other current assets	14,795	17,209	15,772
Total current assets	613,950	599,529	640,166
Property, plant and equipment, net	252,710	254,597	269,127
Operating lease right-of-use assets	35,111
Goodwill	132,312	130,250	136,398
Equity investment	2,498	2,487	2,528
Intangible assets, net	22,991	24,402	26,761
Other noncurrent assets	10,346	10,398	10,907
Total Assets	1,069,918	1,021,663	1,085,887
Current liabilities
Trade accounts payable	39,241	34,361	47,985
Accrued liabilities and other current liabilities	118,000	117,219	120,007
Total current liabilities	157,241	151,580	167,992
Operating lease liabilities	28,164
Deferred income tax and other long-term liabilities	16,092	14,569	14,093
Total liabilities	201,497	166,149	182,085
Commitments and contingencies (see Note 12)
Stockholders’ equity
Common stock, at par value	446	453	462
Additional paid-in capital	277,024	276,504	271,735
Retained Earnings	615,529	628,207	652,124
Treasury stock	0	(25,000)	(440)
Accumulated other comprehensive loss	(24,578)	(24,650)	(20,079)
Total stockholders’ equity	868,421	855,514	903,802
Total liabilities and stockholders’ equity	$ 1,069,918	$ 1,021,663	$ 1,085,887