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STATEMENTS OF CASH FLOWS Table 1 (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Decrease (increase) in current assets:      
Accounts receivable $ 67,257 $ 72,298 $ 107,209
Receivable from related parties 0 50,918 58,692
Inventories 16,776 82,075 31,975
Other current assets 4,414 3,785 26,139
Increase (decrease) in current liabilities:      
Accounts payable (32,152) (153,671) (96,330)
Payable to related party (872) 837 6,922
Accrued interest payable 941 303 9,370
Accrued liabilities (7,834) 22,980 (32,452)
Taxes other than income tax (1,522) 4,341 (87)
Income tax payable 3,551 (1,448) 1,338
Changes in current assets and current liabilities $ (50,559) $ (82,418) $ (112,776)