Condensed Consolidated Statements of Cash Flows (unaudited) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018
Cash flows from operating activities:
Net income (loss)	$ 40,535	$ (13,649)
Adjustments to reconcile net income (loss) to net cash provided (used) by operating activities:
Depreciation and amortization	19,698	20,755
Provision for doubtful accounts	1,086	145
Provision for warranties	7,020	10,115
Deferred compensation expense (benefit)	74	(441)
Stock-based compensation	2,118	1,770
Deferred income tax provision	9,193	1,587
(Gain) loss on disposition of fixed assets	309	(249)
Distributions to SERP participants	(2,067)	(291)
Change in operating assets and liabilities:
Sale (purchase) of trading securities, net	883	(628)
Trade and other receivables	18,150	(7,512)
Inventories	(1,261)	(37,841)
Prepaid expenses and other assets	849	796
Accounts payable	(8,899)	14,047
Accrued pellet plant agreement costs	0	17,000
Accrued product warranty	(8,004)	(14,480)
Customer deposits	(4,247)	2,895
Prepaid and income taxes payable, net	8,964	(11,055)
Other	(226)	(3,498)
Net cash provided (used) by operating activities	84,175	(20,534)
Cash flows from investing activities:
Expenditures for property and equipment	(17,924)	(17,518)
Proceeds from sale of property and equipment	268	330
Other	1,407	83
Net cash used by investing activities	(16,249)	(17,105)
Cash flows from financing activities:
Payment of dividends	(7,436)	(7,149)
Stock buy-back purchases	0	(13,914)
Borrowings under bank loans	164,850	48,523
Repayments of bank loans	(223,984)	(24,741)
Sale of Company shares held by SERP	192	246
Withholding tax paid upon vesting of restricted stock units	(312)	(432)
Purchase of subsidiary shares	(16)	(27)
Net cash provided (used by) financing activities	(66,706)	2,506
Effect of exchange rates on cash	(752)	(1,473)
Net change in cash and cash equivalents	468	(36,606)
Cash and cash equivalents, beginning of period	25,821	62,280
Cash and cash equivalents, end of period	$ 26,289	$ 25,674