SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Tables)

12 Months Ended

Dec. 31, 2014

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES [Abstract]

Depreciation, Depletion, Accretion and Amortization Expense

in thousands	2014	2013	2012
Depreciation, Depletion, Accretion and Amortization
Depreciation	$      239,611	$     271,180	$     301,146
Depletion	16,741	13,028	10,607
Accretion	11,601	10,685	7,956
Amortization of leaseholds	578	483	381
Amortization of intangibles	10,966	11,732	11,869
Total	$      279,497	$     307,108	$     331,959

Fair Value Measurement on Recurring Basis

	Level 1
in thousands	2014	2013
Fair Value Recurring
Rabbi Trust
Mutual funds	$       15,532	$     15,255
Equities	11,248	12,828
Total	$       26,780	$     28,083

	Level 2
in thousands	2014	2013
Fair Value Recurring
Rabbi Trust
Common/collective trust funds	$        1,415	$       1,244
Total	$        1,415	$       1,244

Assets Subject to Fair Value Measurement on Nonrecurring Basis

	As of December 31, 2014
		Impairment
in thousands	Level 2	Charges
Fair Value Nonrecurring
Property, plant & equipment	$       2,172	$       3,095
Totals	$       2,172	$       3,095

Summary Of Recognized Deferred Revenue

in thousands	2014	2013	2012
Deferred Revenue
Balance at beginning of year	$      224,743	$       73,583	$                0
Cash received and revenue deferred	187	153,156	73,583
Amortization of deferred revenue	(4,962)	(1,996)	0
Balance at end of year	$      219,968	$     224,743	$       73,583

Summary of Estimated Future Compensation Cost Related to Share-Based Awards Granted to Employees Under Long-Term Incentive Plans

	Unrecognized	Expected
	Compensation	Weighted-average
dollars in thousands	Expense	Recognition (Years)
Share-based Compensation
SOSARs 1	$          3,078	2.0
Performance and restricted shares	18,243	2.4
Total/weighted-average	$        21,321	2.3

1 Stock-Only Stock Appreciation Rights (SOSARs)

Pretax Compensation Expense Related to Employee Share-based Compensation Awards and Related Income Tax Benefits

in thousands	2014	2013	2012
Employee Share-based Compensation Awards
Pretax compensation expense	$        22,217	$       20,187	$       15,491
Income tax benefits	8,571	7,833	6,011

Liabilities Under Self-Insurance Program

dollars in thousands	2014	2013
Self-insurance Program
Self-insured liabilities (undiscounted)	$        43,731	$       50,538
Insured liabilities (undiscounted)	17,758	17,497
Discount rate	1.29%	0.98%
Amounts Recognized in Consolidated
Balance Sheets
Investments and long-term receivables	$        16,884	$       16,917
Other accrued liabilities	(13,131)	(16,657)
Other noncurrent liabilities	(45,569)	(49,148)
Net liabilities (discounted)	$       (41,816)	$     (48,888)

Estimated Payments (Undiscounted) Under Our Self-Insurance Program

in thousands
Estimated Payments under Self-insurance Program
2015	$        18,585
2016	11,210
2017	7,704
2018	5,347
2019	3,835

Weighted-Average Common Shares Outstanding

in thousands	2014	2013	2012
Weighted-average common shares outstanding	131,461	130,272	129,745
Dilutive effect of
Stock options/SOSARs	656	461	0
Other stock compensation plans	874	734	0
Weighted-average common shares outstanding,
assuming dilution	132,991	131,467	129,745

Antidilutive Common Stock Equivalents

in thousands	2014	2013	2012
Antidilutive common stock equivalents	2,352	2,895	4,762