LEASES (Narrative) (Details) - USD ($) |
Sep. 30, 2019 |
Jan. 01, 2019 |
Dec. 31, 2018 |
|---|---|---|---|
| Lessee, Lease, Description [Line Items] | |||
| Operating lease assets | $ 13,920,000 | ||
| Lease liability | 62,369,000 | ||
| Accumulated deficit | $ (596,922,000) | $ (845,368,000) | |
| Weighted average remaining lease term | 1 year 9 months 25 days | ||
| Weighted-average discount rate - operating leases | 3.66% | ||
| Accounting Standards Update 2016-02 | |||
| Lessee, Lease, Description [Line Items] | |||
| Operating lease assets | $ 110,000,000 | ||
| Lease liability | 110,000,000 | ||
| Accumulated deficit | $ 0 | ||
| Minimum | |||
| Lessee, Lease, Description [Line Items] | |||
| Lease term | 1 year | ||
| Maximum | |||
| Lessee, Lease, Description [Line Items] | |||
| Lease term | 5 years | ||
| Drilling Rig | Minimum | |||
| Lessee, Lease, Description [Line Items] | |||
| Lease term | 1 year | ||
| Drilling Rig | Maximum | |||
| Lessee, Lease, Description [Line Items] | |||
| Lease term | 2 years |
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. No definition available.
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- Definition Term of lessee's operating lease, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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- Definition Present value of lessee's discounted obligation for lease payments from operating lease. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- Definition Amount of lessee's right to use underlying asset under operating lease. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- Definition Weighted average discount rate for operating lease calculated at point in time. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- Definition Weighted average remaining lease term for operating lease, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Reference 1: http://www.xbrl.org/2003/role/exampleRef
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- Definition The cumulative amount of the reporting entity's undistributed earnings or deficit. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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