Condensed Consolidated Statements of Cash Flows (unaudited) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015
Cash flows from operating activities:
Net income	$ 35,819	$ 26,574
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	11,787	12,111
Provision (benefit) for doubtful accounts	320	(330)
Provision for warranties	8,300	8,462
Deferred compensation provision	998	324
Stock-based compensation	1,020	856
Tax benefit from stock incentive plans	0	(344)
Deferred income tax benefit	(3,353)	(3,319)
Gain on disposition of fixed assets	(97)	(205)
Distributions to SERP participants	(92)	(2,595)
Change in operating assets and liabilities:
Sale (purchase) of trading securities, net	(1,106)	(736)
Trade and other receivables	(25,782)	(10,345)
Inventories	5,299	5,410
Prepaid expenses	(6,116)	3,245
Other assets	1,536	8
Accounts payable	6,497	(8,516)
Accrued product warranty	(5,569)	(7,671)
Customer deposits	22,357	(13,255)
Prepaid and income taxes payable, net	4,704	2,664
Other	7,531	2,024
Net cash provided by operating activities	64,053	14,362
Cash flows from investing activities:
Expenditures for property and equipment	(13,265)	(10,669)
Proceeds from sale of property and equipment	144	298
Other	(121)	819
Net cash used by investing activities	(13,242)	(9,552)
Cash flows from financing activities:
Payment of dividends	(4,608)	(4,595)
Borrowings under bank loans	1,339	77,207
Repayments of bank loans	(2,337)	(74,784)
Tax benefit from stock issued under incentive plans	0	344
Sale (purchase) of Company shares held by SERP, net	(97)	2,081
Withholding tax paid upon vesting of restricted stock units	(1,022)	(600)
Purchase of subsidiary's shares	(724)	(653)
Net cash used by financing activities	(7,449)	(1,000)
Effect of exchange rates on cash	49	(480)
Net increase in cash and cash equivalents	43,411	3,330
Cash and cash equivalents, beginning of period	25,062	13,023
Cash and cash equivalents, end of period	$ 68,473	$ 16,353