CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Cash Flows from Operating Activities
Net income	$ 40,368	$ 40,020	$ 32,572
Adjustments to reconcile net income to net cash provided by operating activities:
Gain on sale of subsidiary	(5,358)	0	0
Depreciation	20,945	18,551	18,022
Amortization	2,103	708	706
Provision (credit) for doubtful accounts	759	1,510	(11)
Provision for warranty	11,152	13,029	13,365
Deferred compensation provision (benefit)	115	(45)	539
Deferred income tax provision (benefit)	6,150	(1,982)	(497)
Asset impairment charges	0	2,724	0
Gain on disposition of fixed assets	(256)	(54)	(8)
Tax benefit from stock option exercises	(107)	(310)	(579)
Stock-based compensation	1,285	2,800	2,395
Sale (purchase) of trading securities, net	(146)	1,733	946
(Increase) decrease in:
Trade and other receivables	7,555	(24,554)	(11,911)
Inventories	(40,133)	(32,017)	(2,115)
Prepaid expenses	(1,728)	177	5,532
Other assets	(1,566)	45	511
Increase (decrease) in:
Accounts payable	(6,425)	9,002	7,351
Customer deposits	4,918	6,235	8,328
Accrued product warranty	(11,021)	(10,524)	(12,293)
Income taxes payable	1,366	420	972
Accrued retirement benefit costs	(218)	(446)	(1,098)
Accrued loss reserves	(1,435)	342	(1,210)
Other accrued liabilities	298	4,983	2,267
Other	12	(40)	(1,748)
Net cash provided by operating activities	28,633	32,307	62,036
Cash Flows from Investing Activities
Business acquisitions	0	(33,407)	0
Proceeds from sale of subsidiary	42,940	0	0
Proceeds from sale of property and equipment	375	260	202
Expenditures for property and equipment	(26,018)	(36,130)	(11,336)
Sale of intangible assets acquired	0	500	0
Net cash provided (used) by investing activities	17,297	(68,777)	(11,134)
Cash Flows from Financing Activities
Payment of dividends	(22,790)	0	0
Proceeds from issuance of common stock	514	812	1,431
Tax benefit from stock option exercise	107	310	579
Cash from sale (acquisition) of shares of subsidiary	904	29	41
Purchase of company shares by Supplemental Executive Retirement Plan, net	(373)	(266)	(25)
Withholding tax paid upon vesting of restricted stock units	(834)	0	0
Net cash provided (used) by financing activities	(22,472)	885	2,026
Effect of exchange rates on cash	(34)	(1,507)	1,240
Increase (decrease) in cash and cash equivalents	23,424	(37,092)	54,168
Cash and cash equivalents, beginning of year	57,505	94,597	40,429
Cash and cash equivalents, end of year	80,929	57,505	94,597
Cash paid during the year for:
Interest	366	193	352
Income taxes, net of refunds	$ 13,722	$ 21,473	$ 8,504