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STATEMENTS OF CASH FLOWS Table 1 - Changes in Current Assets and Current Liabilities (Details) - USD ($)
$ in Thousands
9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Decrease (increase) in current assets:    
Accounts receivable $ 11,530 $ 24,538
Receivable from related party 160 236
Inventories 2,079 15,497
Other current assets (953) 1,176
Increase (decrease) in current liabilities:    
Accounts payable 18,082 (52,910)
Accrued interest payable (9,700) 7,829
Accrued liabilities 4,830 (10,702)
Taxes other than income tax 4,809 279
Income tax payable 406 (3,614)
Changes in current assets and current liabilities $ 31,243 $ (17,671)