| **SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES Detail (Details) - USD ($) $ in Millions** | 12 Months Ended |
|-----------------------------------------------------------------------------------------|-----------------|
||
| **Significant Accounting Plicies [Line Items]**                                         |            |   |   |
| Certificates of Deposit and Cash                                                        | $ 0.7           | $ 0.7 |   |
| Inventory, Net                                                                          | 0.6             | 0.8 |   |
| White Cliffs pipeline line fill crude oil inventory                                     | 1.1             |   |   |
| Impairment of other property and equipment                                              | 0.0             | 0.8 |   |
| Non-Oil and gas Depreciation, Depletion and Amortization                                | 4.5             | 4.1 | $ 4.0 |
| Capitalized Interest                                                                    | 5.1             | 3.5 | $ 1.7 |
| Production Tax Liability                                                                | 19.0            | 26.4 |   |
| Debt Issuance Cost                                                                      | 11.4            | 13.7 |   |
| 7.75% Senior Notes [Member]                                                             |            |   |   |
| **Significant Accounting Plicies [Line Items]**                                         |            |   |   |
| Debt Issuance Cost                                                                      | $ 7.6           | 8.7 |   |
| Debt Instrument, Interest Rate, Stated Percentage                                       | 7.75%           |   |   |
| Revolving Credit Facility [Member]                                                      |            |   |   |
| **Significant Accounting Plicies [Line Items]**                                         |            |   |   |
| Debt Issuance Cost                                                                      | $ 3.6           | 4.3 |   |
| 3.25% Convertible Note [Member]                                                         |            |   |   |
| **Significant Accounting Plicies [Line Items]**                                         |            |   |   |
| Debt Issuance Cost                                                                      | $ 0.2           | $ 0.7 |   |

| X                                                                                                                                                                                                                                     |
|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Production Tax Liability
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|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
[Line Items] for Significant Accounting Plicies [Table]
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| - Definition
A savings certificate entitling the Entity (that is, bearer) to receive interest at an established maturity date, based upon a fixed interest rate.  A certificate of deposit may be issued in any denomination. Certificates of deposit are generally issued by commercial banks and, therefore, insured by the FDIC (up to the prescribed limit).  Certificates of deposit generally restrict holders from withdrawing funds on demand without the incurrence of penalties.  Generally, only certificates of deposit with original maturities of three months or less qualify as cash equivalents. Original maturity means original maturity to the entity holding the investment. As a related example, both a three-month US Treasury bill and a three-year Treasury note purchased three months from maturity qualify as cash equivalents. However, a Treasury note purchased three-years ago does not become a cash equivalent when its remaining maturity is three months.
+ References
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| - Definition
Contractual interest rate for funds borrowed, under the debt agreement.
+ References
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|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount of debt issuance costs (for example, but not limited to, legal, accounting, broker, and regulatory fees).
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|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The current period expense charged against earnings on long-lived, physical assets not used in production, and which are not intended for resale, to allocate or recognize the cost of such assets over their useful lives; or to record the reduction in book value of an intangible asset over the benefit period of such asset; or to reflect consumption during the period of an asset that is not used in production.
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|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The aggregate amount of write-downs for impairments recognized during the period for long lived assets held for use (including those held for disposal by means other than sale).
+ References
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|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount of interest capitalized during the period.
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|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount after valuation and LIFO reserves of inventory expected to be sold, or consumed within one year or operating cycle, if longer.
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| - Definition
Inventories not expected to be converted to cash, sold or exchanged within the normal operating cycle.
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