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Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Cash flows from operating activities    
Net loss $ (40,581) $ (22,562)
Adjustments to reconcile net loss to net cash flows (used in) provided by operating activities:    
Net proceeds from Shoals transaction 2,655  
Depreciation and amortization 12,017 9,366
Recognition of deferred income from state and local incentives (2,220) (2,219)
Gain on sale of facility (573)  
Deferred income taxes 9,969 (6,424)
Stock-based compensation recognized 3,198 1,162
Other non-cash items, net 269 1,957
Changes in operating assets and liabilities, net of acquisitions:    
Accounts receivable (10,637) 16,216
Inventories (16,311) 50,639
Other assets 1,728 (3,248)
Accounts and contractual payables 10,693 (11,170)
Accrued payroll and employee benefits (165) (1,305)
Income taxes receivable/payable 657 9,623
Accrued warranty 1,247 (262)
Other liabilities (2,461) (754)
Accrued pension costs and accrued postretirement benefits (1,129) (678)
Net cash flows (used in) provided by operating activities (31,644) 40,341
Cash flows from investing activities    
Purchase of restricted certificates of deposit (8,312) (9,966)
Maturity of restricted certificates of deposit 9,080 6,856
Purchase of securities held to maturity (111,356) (85,821)
Proceeds from maturity of securities 136,716 43,080
Cost of railcars available for lease (37,347)  
Purchase of property, plant and equipment (2,185) (967)
Proceeds from sale of property, plant and equipment and railcars available for lease 2,458 119
State and local incentives received   1,410
Net cash flows used in investing activities (10,946) (45,289)
Cash flows from financing activities    
Employee stock settlement (118) (23)
Cash dividends paid to stockholders   (3,351)
Deferred financing costs (10)  
Net cash flows used in financing activities (128) (3,374)
Net decrease in cash and cash equivalents (42,718) (8,322)
Cash, cash equivalents and restricted cash equivalents at beginning of year 87,788 96,110
Cash, cash equivalents and restricted cash equivalents at end of year 45,070 87,788
Supplemental cash flow information    
Interest paid 68 72
Income tax refunds received 599 11,929
Income taxes paid $ 5 $ 104