Condensed Consolidated Statements of Cash Flows (unaudited) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017
Cash flows from operating activities:
Net income (loss)	$ (20,552)	$ 29,439
Adjustments to reconcile net income (loss) to net cash provided (used) by operating activities:
Depreciation and amortization	13,880	12,777
Provision for doubtful accounts	148	89
Provision for warranties	7,529	8,248
Deferred compensation provision (benefit)	99	(758)
Stock-based compensation	1,321	1,814
Deferred income tax benefit	(121)	(245)
Gain on disposition of fixed assets	(183)	(197)
Distributions to SERP participants	(184)	(123)
Change in operating assets and liabilities:
Sale (purchase) of trading securities, net	(336)	(55)
Trade and other receivables	(24,219)	(38,551)
Inventories	(3,410)	(20,919)
Prepaid expenses	2,278	3,502
Other assets	(3,639)	(186)
Accounts payable	4,181	7,662
Accrued pellet plant agreement costs	68,000	0
Accrued product warranty	(11,482)	(7,184)
Customer deposits	(4,163)	6,813
Prepaid and income taxes payable, net	(9,141)	(7,847)
Other	(1,585)	(3,331)
Net cash provided (used) by operating activities	18,421	(9,052)
Cash flows from investing activities:
Expenditures for property and equipment	(8,719)	(10,846)
Proceeds from sale of property and equipment	243	211
Other	95	(561)
Net cash used by investing activities	(8,381)	(11,196)
Cash flows from financing activities:
Payment of dividends	(4,618)	(4,613)
Repayments of bank loans	(1,105)	(5,929)
Sale of Company shares held by SERP	279	159
Withholding tax paid upon vesting of restricted stock units	(432)	(501)
Purchase of subsidiary shares	(27)	(31)
Net cash used by financing activities	(5,903)	(10,915)
Effect of exchange rates on cash	(1,211)	899
Net change in cash and cash equivalents	2,926	(30,264)
Cash and cash equivalents, beginning of period	62,280	82,371
Cash and cash equivalents, end of period	$ 65,206	$ 52,107