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SEGMENT INFORMATION (Details 2) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Dec. 31, 2014 | Sep. 30, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Dec. 31, 2013 | Sep. 30, 2015 | Sep. 30, 2014 | Sep. 30, 2013
Segment information |  |  |  |  |  |  |  |  |  |  |
Operating revenues | $ 566,110 | $ 659,694 | $ 883,052 | $ 1,056,585 | $ 985,038 | $ 952,087 | $ 893,430 | $ 889,152 | $ 3,165,441 | $ 3,719,707 | $ 3,387,614
Long-Lived Assets | 5,567,235 |  |  |  | 5,188,544 |  |  |  | 5,567,235 | 5,188,544 | $ 4,676,103
Accounts receivable, net of reserve | 449,344 |  |  |  | 705,214 |  |  |  | $ 449,344 | $ 705,214 |
Operating revenues | Customer concentration | Customer one |  |  |  |  |  |  |  |  |  |  |
Segment information |  |  |  |  |  |  |  |  |  |  |
Concentration percentage |  |  |  |  |  |  |  |  | 10.60% | 7.30% | 10.80%
Operating revenues | Customer concentration | Customer two |  |  |  |  |  |  |  |  |  |  |
Segment information |  |  |  |  |  |  |  |  |  |  |
Concentration percentage |  |  |  |  |  |  |  |  | 9.80% | 10.70% | 9.50%
Receivables | Customer concentration |  |  |  |  |  |  |  |  |  |  |
Segment information |  |  |  |  |  |  |  |  |  |  |
Accounts receivable, net of reserve | 116,900 |  |  |  | 121,400 |  |  |  | $ 116,900 | $ 121,400 |
United States |  |  |  |  |  |  |  |  |  |  |
Segment information |  |  |  |  |  |  |  |  |  |  |
Operating revenues |  |  |  |  |  |  |  |  | 2,750,043 | 3,338,365 | $ 3,011,760
Long-Lived Assets | 5,149,315 |  |  |  | 4,753,844 |  |  |  | 5,149,315 | 4,753,844 | 4,345,950
Argentina |  |  |  |  |  |  |  |  |  |  |
Segment information |  |  |  |  |  |  |  |  |  |  |
Operating revenues |  |  |  |  |  |  |  |  | 169,359 | 107,945 | 73,208
Long-Lived Assets | 213,938 |  |  |  | 144,823 |  |  |  | 213,938 | 144,823 | 83,149
Colombia |  |  |  |  |  |  |  |  |  |  |
Segment information |  |  |  |  |  |  |  |  |  |  |
Operating revenues |  |  |  |  |  |  |  |  | 74,339 | 85,176 | 100,052
Long-Lived Assets | 103,316 |  |  |  | 107,112 |  |  |  | 103,316 | 107,112 | 81,315
Ecuador |  |  |  |  |  |  |  |  |  |  |
Segment information |  |  |  |  |  |  |  |  |  |  |
Operating revenues |  |  |  |  |  |  |  |  | 34,211 | 69,195 | 67,890
Long-Lived Assets | 29,142 |  |  |  | 70,742 |  |  |  | 29,142 | 70,742 | 63,894
Other foreign |  |  |  |  |  |  |  |  |  |  |
Segment information |  |  |  |  |  |  |  |  |  |  |
Operating revenues |  |  |  |  |  |  |  |  | 137,489 | 119,026 | 134,704
Long-Lived Assets | $ 71,524 |  |  |  | $ 112,023 |  |  |  | $ 71,524 | $ 112,023 | $ 101,795

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