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12. Segment Information (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Revenues $ 165,557 $ 201,998
Cost of goods sold 154,532 189,300
Gross profit 11,025 12,698
Expenses    
Research and development expenses 213 205
Selling, general and administrative expenses 16,882 17,424
Interest expense 26,344 25,755
Accretion of Series A preferred units 4,673 2,257
Loss contingency on litigation 0 6,200
Other expense (income) 548 (797)
Income (loss) before income taxes (37,635) (38,346)
Capital expenditures 19,340 8,578
Depreciation 4,894 4,434
Total assets 125,139 99,896
North America    
Revenues 149,762 154,148
Cost of goods sold 140,339 150,197
Gross profit 9,423 3,951
Expenses    
Research and development expenses 213 205
Selling, general and administrative expenses 15,150 13,279
Interest expense 26,306 25,404
Accretion of Series A preferred units 4,673 2,257
Loss contingency on litigation 0 6,200
Other expense (income) 577 25
Income (loss) before income taxes (37,496) (43,419)
Capital expenditures 17,969 7,519
Depreciation 4,233 3,822
Total assets 112,312 82,990
India    
Revenues 15,795 47,850
Cost of goods sold 14,193 39,103
Gross profit 1,602 8,747
Expenses    
Research and development expenses 0 0
Selling, general and administrative expenses 1,732 4,145
Interest expense 38 351
Accretion of Series A preferred units 0 0
Loss contingency on litigation 0 0
Other expense (income) (29) (822)
Income (loss) before income taxes (139) 5,073
Capital expenditures 1,371 1,059
Depreciation 661 612
Total assets $ 12,827 $ 16,906