Condensed Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013	Mar. 31, 2013
Current assets
Cash and cash equivalents	$ 211,988	$ 251,208	$ 141,965
Trade accounts receivable, net	114,159	90,017	102,813
Inventories	216,529	197,728	202,341
Deferred income taxes	12,998	12,699	12,419
Assets held for sale			577
Other current assets	16,073	16,454	20,377
Total current assets	571,747	568,106	480,492
Property, plant and equipment, net	207,457	209,533	211,010
Goodwill	129,433	129,218	122,582
Intangible assets, net	39,728	41,773	50,636
Other noncurrent assets	4,804	4,983	6,827
Total assets	953,169	953,613	871,547
Current liabilities
Line of credit and notes payable	83	103	1,214
Trade accounts payable	31,291	34,933	30,958
Accrued liabilities	48,946	51,745	31,290
Accrued profit sharing trust contributions	2,005	5,784	1,849
Accrued cash profit sharing and commissions	8,105	6,049	4,707
Accrued workers' compensation	5,119	4,591	4,673
Total current liabilities	95,549	103,205	74,691
Deferred income tax and other long-term liabilities	10,111	9,129	8,435
Total liabilities	105,660	112,334	83,126
Commitments and contingencies (Note 7)
Stockholders' equity
Common stock, at par value	489	486	485
Additional paid-in capital	208,870	207,418	184,550
Retained earnings	621,260	615,289	597,104
Accumulated other comprehensive income	16,890	18,086	6,282
Total stockholders' equity	847,509	841,279	788,421
Total liabilities and stockholders' equity	$ 953,169	$ 953,613	$ 871,547