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FAIR VALUE MEASUREMENTS (Carrying Value And Fair Value Of Financial Instruments Disclosure) (Details) - USD ($) | Sep. 30, 2016 | Dec. 31, 2015
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Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Debt Instrument, Original Face Value |  | $ 2,833,100,000 |  | $ 3,448,200,000
$700 Million 4.875% 2021 Senior Note [Member] |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Debt Instrument, Original Face Value |  | 325,700,000 | [1] | 412,500,000
$400 Million 5.90% 2020 Senior Notes [Member] |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Debt Instrument, Original Face Value |  | 225,600,000 | [2] | 290,800,000
$500 Million 3.95% 2018 Senior Notes [Member] |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Debt Instrument, Original Face Value |  | 0 | [3] | 311,200,000
$540 Million 8.25% 2020 Lien Notes [Member] |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Debt Instrument, Original Face Value |  | 540,000,000 |  | 540,000,000
$218.5 Million 8.00% 2020 Lien Notes [Member] |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Debt Instrument, Original Face Value | [4] | 218,500,000 |  |
$544 Million 7.75% 2020 Lien Notes[Member] |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Debt Instrument, Original Face Value |  | 430,100,000 | [5] | 544,200,000
Interest Rate Swap [Member] |  |  |  |
Long-term debt: |  |  |  |
Fair Value Adjustment to Interest Rate Hedge |  | 2,000,000 |  | 2,300,000
Carrying Value [Member] | Fair Value, Inputs, Level 2 [Member] |  |  |  |
Long-term debt: |  |  |  |
Total long-term debt, fair value |  | 2,213,400,000 |  | 2,699,400,000
Carrying Value [Member] | Fair Value, Inputs, Level 2 [Member] | Interest Rate Swap [Member] |  |  |  |
Long-term debt: |  |  |  |
Fair Value Adjustment to Interest Rate Hedge |  | 2,000,000 |  | 2,300,000
Fair Value [Member] | Fair Value, Inputs, Level 2 [Member] |  |  |  |
Long-term debt: |  |  |  |
Total long-term debt, fair value |  | 2,045,100,000 |  | 898,200,000
Fair Value [Member] | Fair Value, Inputs, Level 2 [Member] | Interest Rate Swap [Member] |  |  |  |
Long-term debt: |  |  |  |
Fair Value Adjustment to Interest Rate Hedge |  | 2,000,000 |  | 2,300,000
Senior Notes [Member] | $700 Million 4.875% 2021 Senior Note [Member] |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Debt Instrument, Original Face Value |  | 700,000,000 |  | 700,000,000
Senior Notes [Member] | Senior Notes One Point Three Billion [Member] |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Debt Instrument, Original Face Value |  | 1,300,000,000 |  | 1,300,000,000
Senior Notes [Member] | $400 Million 5.90% 2020 Senior Notes [Member] |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Debt Instrument, Original Face Value |  | 400,000,000 |  | 400,000,000
Senior Notes [Member] | $500 Million 3.95% 2018 Senior Notes [Member] |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Debt Instrument, Original Face Value |  | 500,000,000 |  | 500,000,000
Senior Notes [Member] | $540 Million 8.25% 2020 Lien Notes [Member] |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Debt Instrument, Original Face Value |  | 540,000,000 |  |
Senior Notes [Member] | $544 Million 7.75% 2020 Lien Notes[Member] |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Debt Instrument, Original Face Value |  | 544,200,000 |  |
Senior Notes [Member] | Carrying Value [Member] | Fair Value, Inputs, Level 1 [Member] | $700 Million 4.875% 2021 Senior Note [Member] |  |  |  |
Long-term debt: |  |  |  |
Total long-term debt, fair value |  | 324,300,000 |  | 410,600,000
Senior Notes [Member] | Carrying Value [Member] | Fair Value, Inputs, Level 1 [Member] | Senior Notes One Point Three Billion [Member] |  |  |  |
Long-term debt: |  |  |  |
Total long-term debt, fair value |  | 536,400,000 |  | 787,900,000
Senior Notes [Member] | Carrying Value [Member] | Fair Value, Inputs, Level 1 [Member] | $400 Million 5.90% 2020 Senior Notes [Member] |  |  |  |
Long-term debt: |  |  |  |
Total long-term debt, fair value |  | 224,400,000 |  | 288,900,000
Senior Notes [Member] | Carrying Value [Member] | Fair Value, Inputs, Level 1 [Member] | $500 Million 3.95% 2018 Senior Notes [Member] |  |  |  |
Long-term debt: |  |  |  |
Total long-term debt, fair value |  | 0 |  | 309,100,000
Senior Notes [Member] | Carrying Value [Member] | Fair Value, Inputs, Level 1 [Member] | $540 Million 8.25% 2020 Lien Notes [Member] |  |  |  |
Long-term debt: |  |  |  |
Total long-term debt, fair value |  | 504,000,000 |  | 497,400,000
Senior Notes [Member] | Carrying Value [Member] | Fair Value, Inputs, Level 1 [Member] | $544 Million 7.75% 2020 Lien Notes[Member] |  |  |  |
Long-term debt: |  |  |  |
Total long-term debt, fair value |  | 333,800,000 |  | 403,200,000
Senior Notes [Member] | Carrying Value [Member] | Fair Value, Inputs, Level 1 [Member] | Revolving Credit Facility [Member] |  |  |  |
Long-term debt: |  |  |  |
Total long-term debt, fair value | [6] |  |  | 0
Senior Notes [Member] | Carrying Value [Member] | Fair Value, Inputs, Level 2 [Member] | $218.5 Million 8.00% 2020 Lien Notes [Member] |  |  |  |
Long-term debt: |  |  |  |
Total long-term debt, fair value |  | 288,500,000 |  | 0
Senior Notes [Member] | Fair Value [Member] | Fair Value, Inputs, Level 1 [Member] | $700 Million 4.875% 2021 Senior Note [Member] |  |  |  |
Long-term debt: |  |  |  |
Total long-term debt, fair value |  | 260,600,000 |  | 69,400,000
Senior Notes [Member] | Fair Value [Member] | Fair Value, Inputs, Level 1 [Member] | Senior Notes One Point Three Billion [Member] |  |  |  |
Long-term debt: |  |  |  |
Total long-term debt, fair value |  | 400,700,000 |  | 137,400,000
Senior Notes [Member] | Fair Value [Member] | Fair Value, Inputs, Level 1 [Member] | $400 Million 5.90% 2020 Senior Notes [Member] |  |  |  |
Long-term debt: |  |  |  |
Total long-term debt, fair value |  | 194,900,000 |  | 52,800,000
Senior Notes [Member] | Fair Value [Member] | Fair Value, Inputs, Level 1 [Member] | $500 Million 3.95% 2018 Senior Notes [Member] |  |  |  |
Long-term debt: |  |  |  |
Total long-term debt, fair value |  | 0 |  | 87,100,000
Senior Notes [Member] | Fair Value [Member] | Fair Value, Inputs, Level 1 [Member] | $540 Million 8.25% 2020 Lien Notes [Member] |  |  |  |
Long-term debt: |  |  |  |
Total long-term debt, fair value |  | 573,200,000 |  | 414,500,000
Senior Notes [Member] | Fair Value [Member] | Fair Value, Inputs, Level 1 [Member] | $544 Million 7.75% 2020 Lien Notes[Member] |  |  |  |
Long-term debt: |  |  |  |
Total long-term debt, fair value |  | 402,800,000 |  | 134,700,000
Senior Notes [Member] | Fair Value [Member] | Fair Value, Inputs, Level 2 [Member] | $218.5 Million 8.00% 2020 Lien Notes [Member] |  |  |  |
Long-term debt: |  |  |  |
Total long-term debt, fair value |  | 210,900,000 |  | 0
Line of Credit [Member] | Carrying Value [Member] | Fair Value, Inputs, Level 2 [Member] | Revolving Credit Facility [Member] |  |  |  |
Long-term debt: |  |  |  |
Total long-term debt, fair value |  | 0 |  | 0
Line of Credit [Member] | Fair Value [Member] | Fair Value, Inputs, Level 2 [Member] | Revolving Credit Facility [Member] |  |  |  |
Long-term debt: |  |  |  |
Total long-term debt, fair value |  | $ 0 |  | $ 0
[1] | n March 2, 2016, we exchanged as part of an exchange offer $76.3 million of the 4.875 percent senior notes for $30.5 million of the 8.00 percent 1.5 lien notes that were recorded at a carrying value of $41.5 million, including undiscounted interest payments
[2] | On March 2, 2016, we exchanged as part of an exchange offer $65.1 million of the 5.90 percent senior notes for $26.0 million of the 8.00 percent 1.5 lien notes that were recorded at a carrying value of $35.4 million, including undiscounted interest payments as of the transaction date.
[3] | On March 2, 2016, we exchanged as part of an exchange offer $17.6 million of the 3.95 percent senior notes for $11.4 million of the 8.00 percent 1.5 lien notes that were recorded at a carrying value of $15.5 million, including undiscounted interest payments as of the transaction date. Additionally, during the first quarter of 2016, we entered into a debt for equity exchange; see NOTE 15 - CAPITAL STOCK for further discussion of this transaction.
[4] | See the section entitled "$218.5 million 8.00 percent 2020 Senior Secured 1.5 Lien Notes - 2016 Exchange Offers" below for further discussion related to this instrument.
[5] | On March 2, 2016, we exchanged as part of an exchange offer $114.1 million of the 7.75 percent senior notes for $57.0 million of the 8.00 percent 1.5 lien notes that were recorded at a carrying value of $77.5 million, including undiscounted interest payments as of the transaction date.
[6] | As of December 31, 2015, no loans were drawn under the ABL Facility and we had total availability of $366.0 million as a result of borrowing base limitations. As of December 31, 2015, the principal amount of letter of credit obligations totaled $186.3 million and commodity hedge obligations totaled $0.5 million, thereby further reducing available borrowing capacity on our ABL Facility to $179.2 million.

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