FAIR VALUE MEASUREMENTS (Carrying Value And Fair Value Of Financial Instruments Disclosure) (Details) - USD ($)		Sep. 30, 2016		Dec. 31, 2015
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.