DERIVATIVE INSTRUMENTS AND HEDGING ACTIVITIES - Narrative (Details)	1 Months Ended		12 Months Ended
	Sep. 30, 2014 USD ($) instrument	Jun. 30, 2013 USD ($) instrument	Dec. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)	Dec. 31, 2013 USD ($)	Oct. 15, 2014 USD ($) instrument	Jul. 15, 2013 USD ($) instrument
Derivative Instruments And Hedging Activities
Derivatives settled			$ 0	$ 51,469,000	$ 62,009,000
Unrealized losses on derivative instruments			(1,266,000)	21,424,000	$ (37,718,000)
Unrealized gains on derivative instruments			1,266,000	0
Futures Contracts
Derivative Instruments And Hedging Activities
Futures contracts for refined products			$ 33,700,000
4.625% Notes
Derivative Instruments And Hedging Activities
Notes issued	$ 300,000,000.0
5.300% Notes
Derivative Instruments And Hedging Activities
Number of forward-starting interest rate swaps | instrument	6
Derivatives settled	$ 51,500,000
Debt instrument, stated percentage rate	5.30%
4.150% Notes
Derivative Instruments And Hedging Activities
Number of forward-starting interest rate swaps | instrument		6
Derivatives settled		$ 62,000,000
Notes issued		$ 500,000,000.0
Debt instrument, stated percentage rate		4.15%	4.15%
Interest rate derivatives
Derivative Instruments And Hedging Activities
Unrealized losses on derivative instruments				$ 21,400,000
Interest rate swaps, expected net losses reclassified from accumulated other comprehensive loss to earnings over the next twelve months			$ 12,200,000
Interest rate derivatives | 4.625% Notes
Derivative Instruments And Hedging Activities
Number of forward-starting interest rate swaps | instrument							6
Derivative liability, notional amount							$ 300,000,000.0
Interest rate derivatives | 5.300% Notes
Derivative Instruments And Hedging Activities
Number of forward-starting interest rate swaps | instrument						6
Derivative liability, notional amount						$ 275,000,000.0
Amount recognized in interest and debt expense	$ 1,100,000
Interest rate derivatives | 4.150% Notes
Derivative Instruments And Hedging Activities
Amount recognized in interest and debt expense		$ 900,000