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Condensed Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Dec. 31, 2017
Cash flows from operating activities          
Net (loss) income $ (2,336) $ (448) $ (8,740) $ 190  
Adjustments to reconcile net (loss) income to net cash flows (used in) provided by operating activities:          
Net proceeds from Shoals transaction     2,655    
Depreciation and amortization     5,448 4,672  
Recognition of deferred income from state and local incentives     (1,110) (1,109)  
Gain on sale of railcars available for lease     38    
Deferred income taxes     (2,671) (862)  
Stock-based compensation recognized     1,751 371  
Other non-cash items, net     (211) 548  
Changes in operating assets and liabilities, net of acquisitions:          
Accounts receivable     (18,084) 8,364  
Inventories     (11,593) 23,388  
Inventory on lease     (32,228)    
Other assets     (1,697) 141  
Accounts and contractual payables     14,619 (5,772)  
Accrued payroll and employee benefits     895 (1,255)  
Income taxes receivable/payable     684 12,712  
Accrued warranty     1,176 (351)  
Other liabilities     1,402 (243)  
Accrued pension costs and accrued postretirement benefits     (736) (61)  
Net cash flows (used in) provided by operating activities     (48,402) 40,733  
Cash flows from investing activities          
Purchase of restricted certificates of deposit     (4,400) (4,668)  
Maturity of restricted certificates of deposit     4,668 2,084  
Purchase of securities held to maturity     (79,105) (33,915)  
Proceeds from maturity of securities     66,008 3,000  
Cost of railcars available for lease     (1,419)    
Purchase of property, plant and equipment     (476) (445)  
Proceeds from sale of property, plant and equipment and railcars available for lease     600 119  
State and local incentives received       1,410 $ 1,410
Net cash flows used in investing activities     (14,124) (32,415)  
Cash flows from financing activities          
Employee stock settlement     (118) (14)  
Cash dividends paid to stockholders       (2,235)  
Net cash flows used in financing activities     (118) (2,249)  
Net (decrease) increase in cash and cash equivalents     (62,644) 6,069  
Cash, cash equivalents and restricted cash equivalents at beginning of period     87,788 96,110 96,110
Cash, cash equivalents and restricted cash equivalents at end of period $ 25,144 $ 102,179 25,144 102,179 $ 87,788
Supplemental cash flow information          
Interest paid     34 43  
Income tax refunds received     487 11,910  
Income taxes paid     $ 5 $ 85