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Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($)
$ in Thousands
9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Statement Of Cash Flows [Abstract]    
Net cash flows (used in) provided by operating activities - continuing operations $ (8,194) $ 1,555
Cash flows from investing activities:    
Purchases of property, plant and equipment (7,156) (7,215)
Proceeds from sale of ASW (Note 2) 4,292 0
Proceeds from sale of the Avonmore Plant (Note 2) 3,700 0
Purchases of long-term marketable securities (51) (102)
Proceeds from sale of long-term marketable securities 241 247
Net cash flows provided by (used in) investing activities - continuing operations 1,026 (7,070)
Cash flows from financing activities:    
Repayment of debt (27,830) (273)
Proceeds from Revolving Credit and Security Agreement 35,624 23,000
Payments on Revolving Credit and Security Agreement (11,500) (29,500)
Proceeds from sale and leaseback financing arrangement 0 19,000
Dividends paid (7) (35)
Deferred financing costs 0 (477)
Funding of discontinued operations 1,663 (10,069)
Net cash flows (used in) provided by financing activities - continuing operations (2,050) 1,646
Effect of exchange rate changes on cash and cash equivalents (666) (785)
Cash flows from discontinued operations:    
Net cash flows used in operating activities - discontinued operations (3,803) (9,749)
Net cash flows used in investing activities - discontinued operations (158) (1,588)
Net cash flows provided by financing activities - discontinued operations 2,837 10,069
Net cash flows used in discontinued operations (1,124) (1,268)
Net decrease in cash and cash equivalents (11,008) (5,922)
Cash and cash equivalents at beginning of period 20,837 20,700
Cash and cash equivalents at end of period 9,829 14,778
Less: cash and cash equivalents of discontinued operations 0 (775)
Cash and cash equivalents of continuing operations at end of period 9,829 14,003
Supplemental information:    
Income tax payments 1,021 1,126
Interest payments 2,917 1,338
Non-cash investing and financing activities:    
Purchases of property, plant and equipment included in accounts payable 1,022 1,161
Finance lease right-of-use assets exchanged for lease liabilities $ 555 $ 0