Condensed Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Mar. 31, 2012	Dec. 31, 2011	Mar. 31, 2011
Current assets
Cash and cash equivalents	$ 160,092	$ 213,817	$ 301,231
Trade accounts receivable, net	107,257	76,420	91,076
Inventories	184,068	180,129	166,966
Deferred income taxes	12,139	11,774	10,360
Assets held for sale		6,793	9,148
Other current assets	14,095	13,131	11,927
Total current assets	477,651	502,064	590,708
Property, plant and equipment, net	209,460	195,716	184,606
Goodwill	130,556	99,849	71,338
Intangible assets, net	43,484	27,856	22,896
Equity method investment			200
Other noncurrent assets	5,860	10,602	13,422
Total assets	867,011	836,087	883,170
Current liabilities
Line of credit and current portion of long-term debt	3,556
Trade accounts payable	35,109	22,034	29,822
Accrued liabilities	35,746	36,156	31,831
Income taxes payable	1,193
Accrued profit sharing trust contributions	1,683	4,477	6,508
Accrued cash profit sharing and commissions	6,598	3,446	5,396
Accrued workers' compensation	5,485	5,474	4,715
Total current liabilities	89,370	71,587	78,272
Long-term debt, net of current portion	240
Long-term liabilities	6,300	6,137	7,833
Total liabilities	95,910	77,724	86,105
Commitments and contingencies (Note 7)
Stockholders' equity
Common stock, at par value	482	481	500
Additional paid-in capital	174,831	170,483	167,025
Retained earnings	581,779	580,616	608,056
Accumulated other comprehensive income	14,009	6,783	21,484
Total stockholders' equity	771,101	758,363	797,065
Total liabilities and stockholders' equity	$ 867,011	$ 836,087	$ 883,170