LONG-TERM DEBT (Details) (USD $)	0 Months Ended	12 Months Ended
	Dec. 11, 2012	Dec. 31, 2012	Dec. 31, 2011
Debt Instrument [Line Items]
Total long-term debt		$ 2,009,598,000	$ 1,134,358,000
Less: Current maturities		0	(45,023,000)
Long-term debt, excluding current maturities		2,009,598,000	1,089,335,000
Aggregate principal amount		0
Net proceeds from issuance of debt	611,000,000	493,000,000
Redemption amount as percentage of principal (in hundredths)		100.00%
Borrowing capacity under the revolving credit facility		500,000,000
Increase in the borrowing capacity under the revolving credit facility		750,000,000
Maximum borrowing capacity under the revolving credit facility		1,000,000,000
Title XI Notes [Member]
Debt Instrument [Line Items]
Aggregate principal amount redeemed		226,100,000
Notes redeemed in cash		251,500,000
Recognized pretax loss on debt extinguishment		22,200,000
Noncash deferred financing costs		700,000
5% Senior Notes Due 2017 [Member]
Debt Instrument [Line Items]
Stated interest rate (in hundredths)		5.00%
7.875 % Senior Notes, Due August 2019 [Member]
Debt Instrument [Line Items]
Stated interest rate (in hundredths)		7.875%
4.875% Senior Notes, Due June 2022 [Member]
Debt Instrument [Line Items]
Stated interest rate (in hundredths)		4.875%
Aggregate principal amount	200,000,000	500,000,000
Issue amount as percentage of principal (in hundredths)	109.007%	99.333%
5.400% Senior Notes, Due December 2042 [Member]
Debt Instrument [Line Items]
Stated interest rate (in hundredths)		5.40%
Issue amount as percentage of principal (in hundredths)	99.575%
Secured Debt [Member] | Title XI Note Payable, Due March 2012 [Member]
Debt Instrument [Line Items]
Maturity date		March 2012
Stated interest rate (in hundredths)		5.88%
Total long-term debt		0	7,109,000
Secured Debt [Member] | Title XI Note Payable, Due October 2013 [Member]
Debt Instrument [Line Items]
Maturity date		October 2013
Stated interest rate (in hundredths)		2.80%
Total long-term debt		0	30,898,000
Secured Debt [Member] | Title XI Note Payable, Due May 2019 [Member]
Debt Instrument [Line Items]
Maturity date		May 2019
Stated interest rate (in hundredths)		4.33%
Total long-term debt		0	45,598,000
Secured Debt [Member] | Title XI Note Payable, Due May 2020 [Member]
Debt Instrument [Line Items]
Maturity date		May 2020
Stated interest rate (in hundredths)		3.525%
Total long-term debt		0	50,801,000
Secured Debt [Member] | Title XI Note Payable, Due July 2021 [Member]
Debt Instrument [Line Items]
Maturity date		July 2021
Stated interest rate (in hundredths)		3.158%
Total long-term debt		0	104,047,000
Unsecured Debt [Member] | 5% Senior Notes Due 2017 [Member]
Debt Instrument [Line Items]
Maturity date		September 2017
Stated interest rate (in hundredths)		5.00%
Effective interest rate (in hundredths)		5.10%
Total long-term debt		398,678,000	398,394,000
Aggregate principal amount		400,000,000
Unsecured Debt [Member] | 7.875 % Senior Notes, Due August 2019 [Member]
Debt Instrument [Line Items]
Maturity date		August 2019
Stated interest rate (in hundredths)		7.875%
Effective interest rate (in hundredths)		8.00%
Total long-term debt		497,842,000	497,511,000
Aggregate principal amount		500,000,000
Unsecured Debt [Member] | 4.875% Senior Notes, Due June 2022 [Member]
Debt Instrument [Line Items]
Maturity date		June 2022
Stated interest rate (in hundredths)		4.875%
Effective interest rate (in hundredths)		4.60%
Total long-term debt		714,775,000	0
Aggregate principal amount		700,000,000
Unsecured Debt [Member] | 5.400% Senior Notes, Due December 2042 [Member]
Debt Instrument [Line Items]
Maturity date		December 2042
Stated interest rate (in hundredths)		5.40%
Effective interest rate (in hundredths)		5.40%
Total long-term debt		398,303,000	0
Aggregate principal amount		$ 400,000,000