OPERATING LEASES (Tables)

12 Months Ended

Dec. 31, 2013

OPERATING LEASES [Abstract]

Rental Expense from Continuing Operations under Nonmineral Operating Leases

in thousands	2013	2012	2011
Operating Leases
Minimum rentals	$        40,151	$       36,951	$       34,701
Contingent rentals (based principally on usage)	44,111	32,705	29,882
Total	$        84,262	$       69,656	$       64,583

Future Minimum Operating Lease Payments

in thousands
Future Minimum Operating Lease Payments
2014	$        28,539
2015	26,903
2016	25,106
2017	22,055
2018	20,129
Thereafter	133,091
Total	$      255,823