FAIR VALUE MEASUREMENTS (Details) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Financial Assets (Liabilities):
Derivative instruments — assets	$ 6,381
Derivative instruments — liabilities	(10,838)	$ (49,370)
Carrying Amount [Member]
Financial Assets (Liabilities):
Derivative instruments — assets	8,819
Derivative instruments — liabilities	(10,838)	(51,940)
Fair Value [Member]
Financial Assets (Liabilities):
Derivative instruments — assets	8,819
Derivative instruments — liabilities	$ (10,838)	$ (51,940)
Senior Notes 5.875% [Member]
Financial Assets (Liabilities):
Interest rate (as a percent)	5.875%	5.875%
Senior Notes 5.875% [Member] | Carrying Amount [Member]
Financial Assets (Liabilities):
Long-term debt	$ (750,000)	$ (750,000)
Senior Notes 5.875% [Member] | Fair Value [Member]
Financial Assets (Liabilities):
Long-term debt	$ (774,270)	$ (782,835)
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] | Carrying Amount [Member]
Financial Assets (Liabilities):
Long-term debt	$ (750,000)	$ (750,000)
Senior Notes 4.375% [Member] | Fair Value [Member]
Financial Assets (Liabilities):
Long-term debt	$ (781,950)	$ (779,453)
Senior Notes 4.375% [Member] | Fair Value, Inputs, Level 1 [Member]
Financial Assets (Liabilities):
Interest rate (as a percent)	4.375%	4.375%