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SEGMENT INFORMATION - Revenue from external customers and long lived assets (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2015 | Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Dec. 31, 2014 | Sep. 30, 2016 | Sep. 30, 2015 | Sep. 30, 2014
Segment information |  |  |  |  |  |  |  |  |  |  |
Operating revenues | $ 331,708 | $ 366,486 | $ 438,191 | $ 487,847 | $ 553,800 | $ 661,445 | $ 885,670 | $ 1,060,787 | $ 1,624,232 | $ 3,161,702 | $ 3,715,968
Long-Lived Assets | 5,144,733 |  |  |  | 5,563,170 |  |  |  | 5,144,733 | 5,563,170 | $ 5,187,587
Accounts receivable, net of reserve | 375,169 |  |  |  | 445,948 |  |  |  | $ 375,169 | $ 445,948 |
Operating revenues | Customer concentration | Customer one |  |  |  |  |  |  |  |  |  |  |
Segment information |  |  |  |  |  |  |  |  |  |  |
Concentration percentage |  |  |  |  |  |  |  |  | 11.90% | 10.10% | 10.70%
Operating revenues | Customer concentration | Customer two |  |  |  |  |  |  |  |  |  |  |
Segment information |  |  |  |  |  |  |  |  |  |  |
Concentration percentage |  |  |  |  |  |  |  |  | 9.40% | 4.60% | 2.90%
Receivables | Customer concentration |  |  |  |  |  |  |  |  |  |  |
Segment information |  |  |  |  |  |  |  |  |  |  |
Accounts receivable, net of reserve | 49,500 |  |  |  | 101,300 |  |  |  | $ 49,500 | $ 101,300 |
United States |  |  |  |  |  |  |  |  |  |  |
Segment information |  |  |  |  |  |  |  |  |  |  |
Operating revenues |  |  |  |  |  |  |  |  | 1,386,786 | 2,750,043 | $ 3,338,365
Long-Lived Assets | 4,804,328 |  |  |  | 5,149,315 |  |  |  | 4,804,328 | 5,149,315 | 4,753,844
Argentina |  |  |  |  |  |  |  |  |  |  |
Segment information |  |  |  |  |  |  |  |  |  |  |
Operating revenues |  |  |  |  |  |  |  |  | 159,427 | 177,984 | 107,189
Long-Lived Assets | 183,286 |  |  |  | 211,862 |  |  |  | 183,286 | 211,862 | 145,783
Colombia |  |  |  |  |  |  |  |  |  |  |
Segment information |  |  |  |  |  |  |  |  |  |  |
Operating revenues |  |  |  |  |  |  |  |  | 20,488 | 70,076 | 81,168
Long-Lived Assets | 91,815 |  |  |  | 102,401 |  |  |  | 91,815 | 102,401 | 105,842
Ecuador |  |  |  |  |  |  |  |  |  |  |
Segment information |  |  |  |  |  |  |  |  |  |  |
Operating revenues |  |  |  |  |  |  |  |  | 4,948 | 30,987 | 67,976
Long-Lived Assets | 438 |  |  |  | 28,918 |  |  |  | 438 | 28,918 | 71,011
Other foreign |  |  |  |  |  |  |  |  |  |  |
Segment information |  |  |  |  |  |  |  |  |  |  |
Operating revenues |  |  |  |  |  |  |  |  | 52,583 | 132,612 | 121,270
Long-Lived Assets | $ 64,866 |  |  |  | $ 70,674 |  |  |  | $ 64,866 | $ 70,674 | $ 111,107

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