FAIR VALUE MEASUREMENTS (Details) - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
Financial Assets (Liabilities):
Derivative instruments — assets	$ 11,868	$ 10,745
Derivative instruments — liabilities	$ (3,812)
Senior Notes 5.875% [Member]
Financial Assets (Liabilities):
Interest rate (as a percent)	5.875%	5.875%
Senior Notes 5.875% [Member] | Fair Value, Inputs, Level 1 [Member]
Financial Assets (Liabilities):
Interest rate (as a percent)	5.875%	5.875%
Senior Notes 4.375% [Member]
Financial Assets (Liabilities):
Interest rate (as a percent)	4.375%	4.375%
Senior Notes 4.375% [Member] | Fair Value, Inputs, Level 1 [Member]
Financial Assets (Liabilities):
Interest rate (as a percent)	4.375%	4.375%
Carrying Amount [Member]
Financial Assets (Liabilities):
Derivative instruments — assets	$ 12,290	$ 11,246
Derivative instruments — liabilities	(5,684)
Carrying Amount [Member] | Senior Notes 5.875% [Member]
Financial Assets (Liabilities):
Long-term debt	(750,000)	(750,000)
Carrying Amount [Member] | Senior Notes 4.375% [Member]
Financial Assets (Liabilities):
Long-term debt	(750,000)	(750,000)
Fair Value [Member]
Financial Assets (Liabilities):
Derivative instruments — assets	12,290	11,246
Derivative instruments — liabilities	(5,684)
Fair Value [Member] | Senior Notes 5.875% [Member]
Financial Assets (Liabilities):
Long-term debt	(776,250)	(723,750)
Fair Value [Member] | Senior Notes 4.375% [Member]
Financial Assets (Liabilities):
Long-term debt	$ (739,095)	$ (683,318)