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STATEMENTS OF CASH FLOWS Table 1 - Changes in Current Assets and Current Liabilities (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Decrease (increase) in current assets:    
Accounts receivable $ 19,525 $ 3,544
Receivable from related party 133 237
Inventories (2,687) 1,658
Other current assets 3,224 307
Increase (decrease) in current liabilities:    
Accounts payable (7,681) (12,154)
Accrued interest payable 3,552 (6,301)
Accrued liabilities (6,019) (21,006)
Taxes other than income tax (1,558) (2,752)
Income tax payable 2,202 (2,675)
Changes in current assets and current liabilities $ 10,691 $ (39,142)