|**CONCENTRATION OF RISK Accounts Receivable, Net of Allowance for Doubtful Accounts (Details) - USD ($) $ in Thousands**                                                                                                                                                                                                  | Dec. 31, 2017                                                                                                                                                                                                                                                                                                         | Dec. 31, 2016                                                                                                                                                                                                                                                                                                        
|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- | --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- | ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
|**Concentration Risk [Line Items]**                                                                                                                                                                                                                                                                                       |                                                                                                                                                                                                                                                                                                                       |                                                                                                                                                                                                                                                                                                                      
|Income Taxes Receivable                                                                                                                                                                                                                                                                                                   | $ 6,015                                                                                                                                                                                                                                                                                                               |                                                                                                                                                                                                                                                                                                                      
|Allowance for Doubtful Accounts Receivable, Current                                                                                                                                                                                                                                                                       | (3,128)                                                                                                                                                                                                                                                                                                               |                                                                                                                                                                                                                                                                                                                      
|Accounts Receivable, Net, Current                                                                                                                                                                                                                                                                                         | 197,598                                                                                                                                                                                                                                                                                                               |                                                                                                                                                                                                                                                                                                                      
|Natural gas, NGLs and crude oil sales                                                                                                                                                                                                                                                                                     |                                                                                                                                                                                                                                                                                                                       |                                                                                                                                                                                                                                                                                                                      
|**Concentration Risk [Line Items]**                                                                                                                                                                                                                                                                                       |                                                                                                                                                                                                                                                                                                                       |                                                                                                                                                                                                                                                                                                                      
|Accounts Receivable, Gross                                                                                                                                                                                                                                                                                                | 154,260                                                                                                                                                                                                                                                                                                               |                                                                                                                                                                                                                                                                                                                      
|Joint interest billing                                                                                                                                                                                                                                                                                                    |                                                                                                                                                                                                                                                                                                                       |                                                                                                                                                                                                                                                                                                                      
|**Concentration Risk [Line Items]**                                                                                                                                                                                                                                                                                       |                                                                                                                                                                                                                                                                                                                       |                                                                                                                                                                                                                                                                                                                      
|Accounts Receivable, Gross                                                                                                                                                                                                                                                                                                | 34,576                                                                                                                                                                                                                                                                                                                | [1]                                                                                                                                                                                                                                                                                                                  
|Derivative Counterparties                                                                                                                                                                                                                                                                                                 |                                                                                                                                                                                                                                                                                                                       |                                                                                                                                                                                                                                                                                                                      
|**Concentration Risk [Line Items]**                                                                                                                                                                                                                                                                                       |                                                                                                                                                                                                                                                                                                                       |                                                                                                                                                                                                                                                                                                                      
|Accounts Receivable, Gross                                                                                                                                                                                                                                                                                                | (18)                                                                                                                                                                                                                                                                                                                  |                                                                                                                                                                                                                                                                                                                      
|Other Accounts Receivable                                                                                                                                                                                                                                                                                                 |                                                                                                                                                                                                                                                                                                                       |                                                                                                                                                                                                                                                                                                                      
|**Concentration Risk [Line Items]**                                                                                                                                                                                                                                                                                       |                                                                                                                                                                                                                                                                                                                       |                                                                                                                                                                                                                                                                                                                      
|Accounts Receivable, Gross                                                                                                                                                                                                                                                                                                | $ 5,893                                                                                                                                                                                                                                                                                                               |                                                                                                                                                                                                                                                                                                                      
|                                                                                                                                                                                                                                                                                                                         
|[1]
(1) The December 31, 2017 amount includes $13.9 million of pre-closing contracted completion costs of wells associated with the Bayswater Acquisition, which closed in January 2018. Upon closing, the $13.9 million was capitalized and included in properties and equipment, net on the consolidated balance sheet. | [1]                                                                                                                                                                                                                                                                                                                   | (1) The December 31, 2017 amount includes $13.9 million of pre-closing contracted completion costs of wells associated with the Bayswater Acquisition, which closed in January 2018. Upon closing, the $13.9 million was capitalized and included in properties and equipment, net on the consolidated balance sheet.
|[1]                                                                                                                                                                                                                                                                                                                       | (1) The December 31, 2017 amount includes $13.9 million of pre-closing contracted completion costs of wells associated with the Bayswater Acquisition, which closed in January 2018. Upon closing, the $13.9 million was capitalized and included in properties and equipment, net on the consolidated balance sheet.

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