SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Tables)

12 Months Ended

Dec. 31, 2015

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES [Abstract]

Depreciation, Depletion, Accretion and Amortization Expense

in thousands	2015	2014	2013
Depreciation, Depletion, Accretion and Amortization
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 intangibles	15,618	10,966	11,732
Total	$      274,823	$     279,497	$     307,108

Fair Value Measurement on Recurring Basis

	Level 1
in thousands	2015	2014
Fair Value Recurring
Rabbi Trust
Mutual funds	$       11,472	$     15,532
Equities	8,992	11,248
Total	$       20,464	$     26,780

	Level 2
in thousands	2015	2014
Fair Value Recurring
Rabbi Trust
Common/collective trust funds	$        2,124	$       1,415
Total	$        2,124	$       1,415

Fair Value Measurement on Nonrecurring Basis

	Year ending December 31, 2015		Year ending December 31, 2014
		Impairment		Impairment
in thousands	Level 2	Charges	Level 2	Charges
Fair Value Nonrecurring
Property, plant & equipment	$              0	$       2,176	$       2,172	$       3,095
Other intangible assets, net	0	2,858	0	0
Other assets	0	156	0	0
Totals	$              0	$       5,190	$       2,172	$       3,095

Reconciliation of Deferred Revenue Balances

in thousands	2015	2014	2013
Deferred Revenue
Balance at beginning of year	$      219,968	$     224,743	$       73,583
Cash received and revenue deferred	0	187	153,156
Amortization of deferred revenue	(5,908)	(4,962)	(1,996)
Balance at end of year	$      214,060	$     219,968	$     224,743

Unrecognized Compensation Expense

	Unrecognized	Expected
	Compensation	Weighted-average
dollars in thousands	Expense	Recognition (Years)
Share-based Compensation
SOSARs 1	$          4,882	1.6
Performance and restricted shares	22,271	2.5
Total/weighted-average	$        27,153	2.3

1 Stock-Only Stock Appreciation Rights (SOSARs)

Pretax Compensation Expense

in thousands	2015	2014	2013
Employee Share-based Compensation Awards
Pretax compensation expense	$        16,362	$       22,217	$       20,187
Income tax benefits	6,347	8,571	7,833

Liabilities Under Self-Insurance Program

dollars in thousands	2015	2014
Self-insurance Program
Self-insured liabilities (undiscounted)	$        44,618	$       43,731
Insured liabilities (undiscounted)	16,787	17,758
Discount rate	1.44%	1.29%
Amounts Recognized in Consolidated
Balance Sheets
Investments and long-term receivables	$        15,810	$       16,884
Other accrued liabilities	(14,198)	(13,131)
Other noncurrent liabilities	(44,102)	(45,569)
Net liabilities (discounted)	$       (42,490)	$     (41,816)

Estimated Payments (Undiscounted) Under Self-Insurance Program

in thousands
Estimated Payments under Self-insurance Program
2016	$        19,001
2017	10,900
2018	7,743
2019	5,063
2020	3,609

Weighted-Average Common Shares Outstanding

in thousands	2015	2014	2013
Weighted-average common shares outstanding	133,210	131,461	130,272
Dilutive effect of
Stock options/SOSARs	1,027	656	461
Other stock compensation plans	856	874	734
Weighted-average common shares outstanding,
assuming dilution	135,093	132,991	131,467

Antidilutive Common Stock Equivalents

in thousands	2015	2014	2013
Antidilutive common stock equivalents	544	2,352	2,895