CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Cash Flows from Operating Activities
Net income	$ 40,020	$ 32,572	$ 3,106
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation	18,551	18,022	17,752
Amortization	708	706	924
Provision (credit) for doubtful accounts	1,510	(11)	1,023
Provision for warranty	13,029	13,365	10,908
Deferred compensation provision (benefit)	(45)	539	(399)
Deferred income tax (benefit) provision	(1,982)	(497)	382
Asset impairment charges	2,724	0	17,036
(Gain) loss on disposition of fixed assets	(54)	(8)	66
Tax benefit from stock option exercises	(310)	(579)	(50)
Stock-based compensation	2,800	2,395	1,407
Sale (purchase) of trading securities, net	1,733	946	(2,513)
(Increase) decrease in, net of amounts acquired:
Trade and other receivables	(24,554)	(11,911)	8,171
Inventories	(32,017)	(2,115)	40,875
Prepaid expenses	177	5,532	(698)
Other assets	45	511	905
Accounts payable	9,002	7,351	(16,124)
Customer deposits	6,235	8,328	(15,938)
Accrued product warranty	(10,524)	(12,293)	(12,514)
Income taxes payable	420	972	(486)
Accrued retirement benefit costs	(446)	(1,098)	128
Accrued loss reserves	342	(1,210)	228
Other accrued liabilities	4,983	2,267	(2,667)
Other	(40)	(1,748)	(2,321)
Net cash provided by operating activities	32,307	62,036	49,201
Cash Flows from Investing Activities
Business acquisitions	(33,407)	0	(475)
Proceeds from sale of property and equipment	260	202	283
Expenditures for property and equipment	(36,130)	(11,336)	(17,463)
Sale of intangible assets acquired	500	0	0
Net cash used by investing activities	(68,777)	(11,134)	(17,655)
Cash Flows from Financing Activities
Proceeds from issuance of common stock	812	1,431	880
Tax benefit from stock option exercise	310	579	50
Repayments under revolving line of credit	0	0	(3,427)
Cash from sale (acquisition) of shares of subsidiary	29	41	(635)
Purchase of company shares by Supplemental Executive Retirement Plan, net	(266)	(25)	(78)
Net cash provided (used) by financing activities	885	2,026	(3,210)
Effect of exchange rates on cash	(1,507)	1,240	2,419
Increase (decrease) in cash and cash equivalents	(37,092)	54,168	30,755
Cash and cash equivalents, beginning of year	94,597	40,429	9,674
Cash and cash equivalents, end of year	57,505	94,597	40,429
Cash paid during the year for:
Interest	193	352	488
Income taxes, net of refunds	$ 21,473	$ 8,504	$ 9,319