Condensed Consolidated Statements of Cash Flows (unaudited) (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012
Cash flows from operating activities:
Net income	$ 30,930	$ 30,067
Adjustments to reconcile net income to net cash provided (used) by operating activities:
Depreciation and amortization	16,664	17,523
Provision for doubtful accounts	223	244
Provision for warranties	9,418	9,118
Deferred compensation provision (benefit)	307	(86)
Purchase of trading securities, net	(1,226)	(745)
Stock-based compensation	1,012	731
Tax expense (benefit) from stock incentive plans	77	(170)
Deferred income tax provision (benefit)	(1,541)	3,794
Gain on disposition of fixed assets	(157)	(251)
(Increase) decrease in:
Trade and other receivables	(9,479)	(6,960)
Inventories	(27,143)	(46,984)
Prepaid expenses	864	773
Other assets	(639)	(860)
Increase (decrease) in:
Accounts payable	2,282	(5,714)
Accrued product warranty	(7,640)	(8,366)
Customer deposits	(3,778)	3,257
Prepaid and income taxes payable	(1,697)	(1,515)
Other liabilities	(1,745)	(60)
Net cash provided (used) by operating activities	6,732	(6,204)
Cash flows from investing activities:
Expenditures for property and equipment	(22,142)	(17,288)
Purchase of short-term investments	(15,000)	0
Proceeds from sale of property and equipment	351	620
Net cash used by investing activities	(36,791)	(16,668)
Cash flows from financing activities:
Payment of dividends	(4,570)	0
Tax (expense) benefit from stock issued under incentive plans	(77)	170
Supplemental Executive Retirement Plan transactions, net	2	(198)
Withholding tax paid upon vesting of restricted stock units	(783)	(716)
Proceeds from exercise of stock options	78	492
Purchase of subsidiary shares from minority shareholders	0	(23)
Sale of subsidiaries shares to minority shareholders	2,069	1,030
Net cash provided (used) by financing activities	(3,281)	755
Effect of exchange rates on cash	(1,247)	176
Net decrease in cash and cash equivalents	(34,587)	(21,941)
Cash and cash equivalents, beginning of period	80,929	57,505
Cash and cash equivalents, end of period	$ 46,342	$ 35,564