Condensed Consolidated Statements of Cash Flows (USD $) In Thousands	6 Months Ended
	Jun. 30, 2011	Jun. 30, 2010
Cash flows from operating activities
Net income	$ 26,571	$ 15,903
Adjustments to reconcile net income to net cash provided by (used in) operating activities:
Loss on sale of assets	48	404
Depreciation and amortization	10,055	12,501
Impairment loss on assets held for sale	1,094	17,566
Deferred income taxes	(1,026)	(5,396)
Noncash compensation related to stock plans	2,377	768
Loss in equity method investment	82	275
Excess tax benefit of options exercised	4	(10)
Provision for (recovery of) doubtful accounts	179	(189)
Provision for excess and obsolete inventory		4,932
Accrued interest earned from related party	(58)
Changes in operating assets and liabilities:
Trade accounts receivable	(48,234)	(41,951)
Inventories	(12,404)	(15,703)
Trade accounts payable	(2,386)	1,854
Income taxes payable	7,890	6,883
Accrued profit sharing trust contributions	(2,611)	(3,459)
Accrued cash profit sharing and commissions	10,160	6,966
Other current assets	410	(540)
Accrued liabilities	3,215	4,373
Long-term liabilities	(42)	190
Accrued workers' compensation	979	34
Other noncurrent assets	352	158
Net cash provided by (used in) operating activities	(3,345)	5,559
Cash flows from investing activities
Capital expenditures	(14,095)	(21,628)
Proceeds from sale of capital assets	3,156	60
Loans made to related parties		(1,798)
Loans repaid by related parties	26	50
Net cash used in investing activities	(10,913)	(23,316)
Cash flows from financing activities
Repurchase of common stock	(50,075)
Issuance of common stock	154	955
Excess tax benefit of options exercised	(4)	10
Dividends paid	(11,274)	(9,879)
Net cash used in financing activities	(61,199)	(8,914)
Effect of exchange rate changes on cash and cash equivalents	2,421	(3,947)
Net decrease in cash and cash equivalents	(73,036)	(30,618)
Cash and cash equivalents at beginning of period	335,049	250,381
Cash and cash equivalents at end of period	262,013	219,763
Noncash activity during the period
Noncash capital expenditures	1,587	226
Dividends declared but not paid	6,263	4,978
Issuance of Company's common stock for compensation	$ 204	$ 277