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Industry Segments Additional Details (Details) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2017 USD ($) | Jun. 30, 2016 USD ($) | Jun. 30, 2017 USD ($) | Jun. 30, 2016 USD ($)
Industry Segments Details [Line Items] |  |  |  |
Number of Reportable Segments |  |  | 5 |
Number of Operating Segments |  |  | 4 |
General and administrative expense | $ 31,232 | $ 27,181 | $ 59,688 | $ 60,792
Depreciation, amortization, and accretion | 28,620 | 33,538 | 58,098 | 67,145
Interest expense, net | 14,328 | 14,335 | 28,095 | 28,974
Warrants fair value adjustment |  |  | (11,521) | 0
Other Nonoperating Income (Expense) | (209) | (2,210) | (574) | (1,506)
Corporate Overhead [Member] |  |  |  |
Industry Segments Details [Line Items] |  |  |  |
General and administrative expense | 12,051 | 8,021 | 21,606 | 17,950
Depreciation, amortization, and accretion | 118 | 112 | 209 | 226
Interest expense, net | 4,240 | 5,596 | 8,014 | 11,647
Warrants fair value adjustment | (5,545) | 0 | (11,521) | 0
Other Nonoperating Income (Expense) | $ (305) | $ (2,450) | $ (733) | $ (2,740)
Total Offshore Division [Member] |  |  |  |
Industry Segments Details [Line Items] |  |  |  |
Number of Operating Segments |  |  | 2 |

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