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BUSINESS SEGMENTS AND GEOGRAPHIC INFORMATION - Segment Performance (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2017
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Sales | $ 649,050 | $ 687,974 | $ 720,868 | $ 740,598 | $ 696,825 | $ 648,872 | $ 577,484 | $ 564,087 | $ 2,798,490 | $ 2,487,268 | $ 1,804,741
Operating Income (Loss) | 39,021 | $ (167,874) | $ 95,146 | $ 54,289 | 24,213 | $ 6,306 | $ (1,164) | $ 3,609 | 20,582 | 32,964 | (169,087)
Depreciation and Amortization |  |  |  |  |  |  |  |  | 562,803 | 583,802 | 585,543
Total Assets | 5,839,515 |  |  |  | 6,214,867 |  |  |  | 5,839,515 | 6,214,867 |
Operating Segments |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Sales |  |  |  |  |  |  |  |  | 2,798,490 | 2,487,268 | 1,804,741
Operating Income (Loss) |  |  |  |  |  |  |  |  | 109,233 | 140,021 | (87,545)
Depreciation and Amortization |  |  |  |  |  |  |  |  | 551,465 | 570,662 | 569,997
Total Assets | 5,636,209 |  |  |  | 5,656,332 |  |  |  | 5,636,209 | 5,656,332 | 5,613,084
Intersegment |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Sales |  |  |  |  |  |  |  |  | 0 | 0 | 0
U.S. Land |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Sales |  |  |  |  |  |  |  |  | 2,366,201 | 2,063,362 | 1,437,427
U.S. Land | Operating Segments |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Sales |  |  |  |  |  |  |  |  | 2,366,201 | 2,063,362 | 1,437,427
Operating Income (Loss) |  |  |  |  |  |  |  |  | 93,088 | 148,251 | (97,231)
Depreciation and Amortization |  |  |  |  |  |  |  |  | 496,770 | 504,805 | 499,272
Total Assets | 5,099,583 |  |  |  | 5,007,548 |  |  |  | 5,099,583 | 5,007,548 | 4,962,808
U.S. Land | Intersegment |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Sales |  |  |  |  |  |  |  |  | 0 | 0 | 0
Offshore |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Sales |  |  |  |  |  |  |  |  | 147,635 | 142,500 | 136,263
Offshore | Operating Segments |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Sales |  |  |  |  |  |  |  |  | 147,635 | 142,500 | 136,263
Operating Income (Loss) |  |  |  |  |  |  |  |  | 19,594 | 26,124 | 24,201
Depreciation and Amortization |  |  |  |  |  |  |  |  | 10,010 | 10,392 | 11,764
Total Assets | 102,442 |  |  |  | 105,439 |  |  |  | 102,442 | 105,439 | 99,533
Offshore | Intersegment |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Sales |  |  |  |  |  |  |  |  | 0 | 0 | 0
International Land |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Sales |  |  |  |  |  |  |  |  | 211,731 | 238,356 | 212,972
International Land | Operating Segments |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Sales |  |  |  |  |  |  |  |  | 211,731 | 238,356 | 212,972
Operating Income (Loss) |  |  |  |  |  |  |  |  | 5,366 | (683) | (7,224)
Depreciation and Amortization |  |  |  |  |  |  |  |  | 35,466 | 46,826 | 53,622
Total Assets | 217,094 |  |  |  | 362,033 |  |  |  | 217,094 | 362,033 | 413,392
International Land | Intersegment |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Sales |  |  |  |  |  |  |  |  | 0 | 0 | 0
H&P Technologies |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Sales |  |  |  |  |  |  |  |  | 59,990 | 30,239 | 5,815
H&P Technologies | Operating Segments |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Sales |  |  |  |  |  |  |  |  | 59,990 | 30,239 | 5,815
Operating Income (Loss) |  |  |  |  |  |  |  |  | (12,190) | (39,554) | (13,356)
Depreciation and Amortization |  |  |  |  |  |  |  |  | 7,696 | 7,153 | 3,915
Total Assets | 184,558 |  |  |  | 151,787 |  |  |  | 184,558 | 151,787 | 110,468
H&P Technologies | Intersegment |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Sales |  |  |  |  |  |  |  |  | 0 | 0 | 0
Other |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Sales |  |  |  |  |  |  |  |  | 12,933 | 12,811 | 12,264
Other | Operating Segments |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Sales |  |  |  |  |  |  |  |  | 12,933 | 12,811 | 12,264
Operating Income (Loss) |  |  |  |  |  |  |  |  | 3,375 | 5,883 | 6,065
Depreciation and Amortization |  |  |  |  |  |  |  |  | 1,523 | 1,486 | 1,424
Total Assets | $ 32,532 |  |  |  | $ 29,525 |  |  |  | 32,532 | 29,525 | 26,883
Other | Intersegment |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Sales |  |  |  |  |  |  |  |  | $ 0 | $ 0 | $ 0

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