Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Sep. 30, 2016	Dec. 31, 2015	Sep. 30, 2015
Current assets
Cash and cash equivalents	$ 218,720	$ 258,825	$ 242,795
Trade accounts receivable, net	141,716	106,011	132,727
Inventories	220,207	195,757	200,282
Deferred income taxes	0	16,203	14,782
Other current assets	12,321	12,476	10,302
Total current assets	592,964	589,272	600,888
Property, plant and equipment, net	229,670	213,716	202,885
Goodwill	126,845	123,950	123,277
Intangible assets, net	24,629	27,675	28,570
Other noncurrent assets	10,195	6,696	4,426
Total assets	984,303	961,309	960,046
Current liabilities
Trade accounts payable	24,777	21,309	24,934
Accrued liabilities	62,714	54,761	52,881
Income taxes payable	3,420	0	2,000
Accrued profit sharing trust contributions	5,157	5,799	4,383
Accrued cash profit sharing and commissions	17,153	8,502	12,566
Accrued workers’ compensation	4,161	4,593	4,486
Total current liabilities	117,382	94,964	101,250
Deferred income tax and other long-term liabilities	5,817	16,521	14,415
Total liabilities	123,199	111,485	115,665
Commitments and contingencies (see Note 7)
Stockholders’ equity
Common stock, at par value	486	481	493
Additional paid-in capital	243,900	238,212	225,788
Retained earnings	687,052	639,707	679,673
Treasury stock	(47,002)	0	(39,529)
Accumulated other comprehensive loss	(23,332)	(28,576)	(22,044)
Total stockholders’ equity	861,104	849,824	844,381
Total liabilities and stockholders’ equity	$ 984,303	$ 961,309	$ 960,046