Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income (loss)	$ 42,568	$ (31,168)
Adjustments to reconcile net income (loss) to cash provided (used) by operating activities:
Deferred income taxes	(29,510)	(1,598)
Depreciation	11,054	11,495
Amortization	6,577	7,098
Concrete Tie Settlement expense (Note 18)	0	43,400
Equity (income) loss in nonconsolidated investments	(17)	7
Loss on sales and disposals of property, plant, and equipment	1,192	1,297
Stock-based compensation	3,155	3,836
Pension settlement	2,210	0
Change in operating assets and liabilities:
Accounts receivable	7,928	(11,438)
Inventories	6,688	(23,403)
Other current assets	1,496	140
Prepaid income tax	(1,703)	(249)
Other noncurrent assets	(402)	1,319
Accounts payable	(12,690)	24,210
Deferred revenue	1,782	(3,491)
Accrued payroll and employee benefits	1,018	1,233
Accrued settlement	(10,000)	0
Other current liabilities	(933)	4,046
Other liabilities	(1,116)	(770)
Net cash provided by operating activities	29,297	25,964
CASH FLOWS FROM INVESTING ACTIVITIES:
Proceeds from the sale of property, plant, and equipment	1,151	2,389
Capital expenditures on property, plant, and equipment	(8,831)	(5,251)
Proceeds from sale of equity method investment	0	3,875
Repayment of revolving line of credit from equity method investment	0	1,235
Net cash (used in) provided by investing activities	(7,680)	2,248
CASH FLOWS FROM FINANCING ACTIVITIES:
Repayments of debt	(210,323)	(195,254)
Proceeds from debt	193,534	140,270
Debt issuance costs	(836)	0
Treasury stock acquisitions	(621)	(316)
Net cash used in financing activities	(18,246)	(55,300)
Effect of exchange rate changes on cash and cash equivalents	525	(308)
Net increase (decrease) in cash and cash equivalents	3,896	(27,396)
Cash and cash equivalents at beginning of period	10,282	37,678
Cash and cash equivalents at end of period	14,178	10,282
Supplemental disclosure of cash flow information:
Interest paid	4,587	5,577
Income taxes paid	$ 6,513	$ 4,512