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Commitments and Contingencies (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2017 | Jun. 30, 2016 | Jun. 30, 2017 | Jun. 30, 2016
Write off of Amortization of Leased Assets [Line Items] |  |  |  |
Non-cash provision for leased items no longer in use | $ 12,589 | $ 0 | $ 12,589 | $ 0
Onshore facilities and transportation |  |  |  |
Write off of Amortization of Leased Assets [Line Items] |  |  |  |
Non-cash provision for leased items no longer in use | 12,600 |  |  |
Accrued Liabilities |  |  |  |
Write off of Amortization of Leased Assets [Line Items] |  |  |  |
Loss contingency, accrual, current | $ 4,100 |  | $ 4,100 |

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- Definition Write off of Amortization of Leased Assets- the write off of all future lease expense, and any capitalized deferred leasing costs, on operating lease of assets determined to be no longer in use for the remaining life of the lease. + References No definition available. + Details
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- Definition [Line Items] for Write off of Amortization of Leased Assets [Table] + References No definition available. + Details
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- Definition Amount of loss contingency liability expected to be resolved within one year or the normal operating cycle, if longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=82911808&loc=d3e14326-108349 + Details
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