Condensed Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Sep. 30, 2014	Dec. 31, 2013	Sep. 30, 2013
Current assets
Cash and cash equivalents	$ 258,238	$ 251,208	$ 215,764
Trade accounts receivable, net	127,495	90,017	118,895
Inventories	198,420	197,728	187,255
Deferred income taxes	13,141	12,699	12,330
Other current assets	12,985	16,454	12,519
Total current assets	610,279	568,106	546,763
Property, plant and equipment, net	206,134	209,533	209,641
Goodwill	125,228	129,218	130,270
Intangible assets, net	34,782	41,773	42,541
Other noncurrent assets	5,420	4,983	4,961
Total assets	981,843	953,613	934,176
Current liabilities
Line of credit and notes payable	38	103	956
Trade accounts payable	24,729	34,933	33,450
Accrued liabilities	56,913	51,745	47,268
Accrued profit sharing trust contributions	4,663	5,784	4,573
Accrued cash profit sharing and commissions	13,721	6,049	12,471
Accrued workers’ compensation	4,432	4,591	5,195
Total current liabilities	104,496	103,205	103,913
Deferred income tax and other long-term liabilities	13,224	9,129	7,803
Total liabilities	117,720	112,334	111,716
Commitments and contingencies (Note 7)
Stockholders’ equity
Common stock, at par value	490	486	487
Additional paid-in capital	217,011	207,418	194,721
Retained earnings	648,608	615,289	623,529
Treasury stock	(2,981)	0	(9,825)
Accumulated other comprehensive income	995	18,086	13,548
Total stockholders’ equity	864,123	841,279	822,460
Total liabilities and stockholders’ equity	$ 981,843	$ 953,613	$ 934,176