Condensed Consolidated Statements of Cash Flows (unaudited) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016
Cash flows from operating activities:
Net income	$ 29,439	$ 35,819
Adjustments to reconcile net income to net cash provided (used) by operating activities:
Depreciation and amortization	12,777	11,787
Provision for doubtful accounts	89	320
Provision for warranties	8,248	8,300
Deferred compensation provision (benefit)	(758)	998
Stock-based compensation	1,814	1,020
Deferred income tax benefit	(245)	(3,353)
Gain on disposition of fixed assets	(197)	(97)
Distributions to SERP participants	(123)	(92)
Change in operating assets and liabilities:
Sale (purchase) of trading securities, net	(55)	(1,106)
Trade and other receivables	(38,551)	(25,782)
Inventories	(20,919)	5,299
Prepaid expenses	3,502	(6,116)
Other assets	(186)	1,536
Accounts payable	7,662	6,497
Accrued product warranty	(7,184)	(5,569)
Customer deposits	6,813	22,357
Prepaid and income taxes payable, net	(7,847)	4,704
Other	(3,331)	7,531
Net cash provided (used) by operating activities	(9,052)	64,053
Cash flows from investing activities:
Expenditures for property and equipment	(10,846)	(13,265)
Proceeds from sale of property and equipment	211	144
Other	(561)	(121)
Net cash used by investing activities	(11,196)	(13,242)
Cash flows from financing activities:
Payment of dividends	(4,613)	(4,608)
Borrowings under bank loans	0	1,339
Repayments of bank loans	(5,929)	(2,337)
Sale (purchase) of Company shares held by SERP, net	159	(97)
Withholding tax paid upon vesting of restricted stock units	(501)	(1,022)
Purchase of subsidiary shares	(31)	(724)
Net cash used by financing activities	(10,915)	(7,449)
Effect of exchange rates on cash	899	49
Net increase (decrease) in cash and cash equivalents	(30,264)	43,411
Cash and cash equivalents, beginning of period	82,371	25,062
Cash and cash equivalents, end of period	$ 52,107	$ 68,473