Condensed Consolidated Statements of Cash Flows (unaudited) (USD $)	9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011
Cash flows from operating activities:
Net income	$ 29,587,000	$ 32,027,000
Adjustments to reconcile net income to net cash used by operating activities:
Depreciation and amortization	17,523,000	14,262,000
Provision for doubtful accounts	244,000	1,315,000
Provision for warranties	9,118,000	9,531,000
Deferred compensation benefit	(86,000)	(344,000)
Sale (purchase) of trading securities, net	(745,000)	2,062,000
Stock-based compensation	731,000	2,020,000
Tax benefit from stock incentive plans	(170,000)	(178,000)
Deferred income tax provision (benefit)	3,847,000	(1,401,000)
Asset impairment charge	0	2,170,000
Gain on disposition of fixed assets	(251,000)	(4,000)
(Increase) decrease in:
Trade and other receivables	(6,960,000)	(21,931,000)
Inventories	(46,217,000)	(37,114,000)
Prepaid expenses	773,000	2,137,000
Other assets	(860,000)	(1,929,000)
Increase (decrease) in:
Accounts payable	(5,714,000)	1,078,000
Accrued product warranty	(8,366,000)	(8,166,000)
Customer deposits	3,257,000	2,748,000
Prepaid and income taxes payable	(1,855,000)	(1,986,000)
Other accrued liabilities	(60,000)	(1,215,000)
Net cash used by operating activities	(6,204,000)	(4,918,000)
Cash flows from investing activities:
Expenditures for property and equipment	(17,288,000)	(29,028,000)
Business acquisitions	0	(3,000,000)
Escrow deposit on business acquisition	0	(5,000,000)
Proceeds from sale of property and equipment	620,000	205,000
Net cash used by investing activities	(16,668,000)	(36,823,000)
Cash flows from financing activities:
Tax benefit from stock option exercise	170,000	178,000
Supplemental Executive Retirement Plan transactions, net	(198,000)	(194,000)
Withholding tax paid upon vesting of restricted stock units	(716,000)	0
Proceeds from exercise of stock options	492,000	518,000
Purchase of subsidiary shares from minority shareholders	(23,000)	0
Sale of subsidiaries shares to minority shareholders	1,030,000	0
Net cash provided by financing activities	755,000	502,000
Effect of exchange rates on cash	176,000	(1,621,000)
Net decrease in cash and cash equivalents	(21,941,000)	(42,860,000)
Cash and cash equivalents, beginning of period	57,505,000	94,597,000
Cash and cash equivalents, end of period	$ 35,564,000	$ 51,737,000