Condensed Consolidated Statements of Cash Flows (unaudited) (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013
Cash flows from operating activities:
Net income	$ 25,802	$ 30,930
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	18,149	16,664
Provision for doubtful accounts	418	223
Provision for warranties	12,436	9,418
Deferred compensation provision (benefit)	(243)	307
Purchase of trading securities, net	(434)	(1,226)
Stock-based compensation	972	1,012
Tax expense (benefit) from stock incentive plans	(585)	77
Deferred income tax benefit	(4,124)	(1,541)
Gain on disposition of fixed assets	(164)	(157)
(Increase) decrease in:
Trade and other receivables	(8,432)	(9,479)
Inventories	(19,456)	(27,143)
Prepaid expenses	667	864
Other assets	(3,294)	(639)
Increase (decrease) in:
Accounts payable	1,855	2,282
Accrued product warranty	(12,051)	(7,640)
Customer deposits	(1,178)	(3,778)
Prepaid and income taxes payable	250	(1,697)
Other	2,257	(1,745)
Net cash provided by operating activities	12,845	6,732
Cash flows from investing activities:
Expenditures for property and equipment	(18,445)	(22,142)
Business acquisition, net of cash acquired	(34,965)	0
(Purchase) sale of short-term investments	16,249	(15,000)
Proceeds from sale of property and equipment	551	351
Net cash used by investing activities	(36,610)	(36,791)
Cash flows from financing activities:
Payment of dividends	(6,874)	(4,570)
Borrowings under bank loans	7,782	0
Tax (expense) benefit from stock issued under incentive plans	585	(77)
Supplemental Executive Retirement Plan transactions, net	(99)	2
Withholding tax paid upon vesting of restricted stock units	(953)	(783)
Proceeds from exercise of stock options	282	78
Sale of subsidiaries shares to minority shareholders, net	1,585	2,069
Net cash provided (used) by financing activities	2,308	(3,281)
Effect of exchange rates on cash	(287)	(1,247)
Net decrease in cash and cash equivalents	(21,744)	(34,587)
Cash and cash equivalents, beginning of period	35,564	80,929
Cash and cash equivalents, end of period	$ 13,820	$ 46,342