Condensed Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014	Mar. 31, 2014
Current assets
Cash and cash equivalents	$ 233,587	$ 260,307	$ 211,988
Trade accounts receivable, net	117,316	92,015	114,159
Inventories	205,312	216,545	216,529
Deferred income taxes	12,666	14,662	12,998
Other current assets	19,565	20,789	16,073
Total current assets	588,446	604,318	571,747
Property, plant and equipment, net	205,009	207,027	207,457
Goodwill	122,923	123,881	129,433
Intangible assets, net	31,484	32,587	39,728
Other noncurrent assets	4,797	5,252	4,804
Total assets	952,659	973,065	953,169
Current liabilities
Line of credit and notes payable	0	18	83
Trade accounts payable	21,456	22,860	31,291
Accrued liabilities	46,261	56,078	48,946
Accrued profit sharing trust contributions	1,960	5,384	2,005
Accrued cash profit sharing and commissions	7,131	6,039	8,105
Accrued workers’ compensation	4,479	4,101	5,119
Total current liabilities	81,287	94,480	95,549
Deferred income tax and other long-term liabilities	16,082	15,120	10,111
Total liabilities	97,369	109,600	105,660
Commitments and contingencies (Note 7)
Stockholders’ equity
Common stock, at par value	493	489	489
Additional paid-in capital	226,007	220,982	208,870
Retained earnings	652,298	649,174	621,260
Accumulated other comprehensive income (loss)	(23,508)	(7,180)	16,890
Total stockholders’ equity	855,290	863,465	847,509
Total liabilities and stockholders’ equity	$ 952,659	$ 973,065	$ 953,169