SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Depreciation, Depletion, Accretion and Amortization Expense) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES [Abstract]
Depreciation	$ 238,237	$ 228,866	$ 239,611
Depletion	17,812	18,177	16,741
Accretion	11,059	11,474	11,601
Amortization of leaseholds	267	688	578
Amortization of intangible	17,565	15,618	10,966
Total	$ 284,940	$ 274,823	$ 279,497