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STATEMENTS OF CASH FLOWS Table 1 - Changes in Current Assets and Current Liabilities (Details) - USD ($)
$ in Thousands
12 Months Ended
Mar. 01, 2016
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Decrease (increase) in current assets:        
Accounts receivable   $ (865) $ (23,234) $ 67,257
Receivable from related parties   112 (317) 0
Inventories   11,936 940 16,776
Other current assets   3,393 8,128 4,414
Increase (decrease) in current liabilities:        
Accounts payable   (30,409) 14,071 (32,152)
Payable to related party $ 16,014 0 894 (872)
Accrued interest payable   6,489 (256) 941
Accrued liabilities   (11,157) 161 (7,834)
Taxes other than income tax   (3,529) 2,690 (1,522)
Income tax payable   (2,463) 639 3,551
Changes in current assets and current liabilities   $ (26,493) $ 3,716 $ 50,559