SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Depreciation, Depletion, Accretion and Amortization Expense) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES [Abstract]
Depreciation	$ 228,866	$ 239,611	$ 271,180
Depletion	18,177	16,741	13,028
Accretion	11,474	11,601	10,685
Amortization of leaseholds	688	578	483
Amortization of intangible	15,618	10,966	11,732
Total	$ 274,823	$ 279,497	$ 307,108