SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Tables)
|
12 Months Ended |
Dec. 31, 2016 |
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES [Abstract] |
|
Depreciation, Depletion, Accretion and Amortization Expense |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
in thousands
|
2016
|
|
|
2015
|
|
|
2014
|
|
Depreciation, Depletion, Accretion and Amortization
|
|
|
|
|
|
|
|
|
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 intangibles
|
17,565
|
|
|
15,618
|
|
|
10,966
|
|
Total
|
$ 284,940
|
|
|
$ 274,823
|
|
|
$ 279,497
|
|
|
Fair Value Measurement on Recurring Basis |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Level 1 Fair Value
|
in thousands
|
2016
|
|
|
2015
|
|
Fair Value Recurring
|
|
|
|
|
|
Rabbi Trust
|
|
|
|
|
|
Mutual funds
|
$ 6,883
|
|
|
$ 11,472
|
|
Equities
|
10,033
|
|
|
8,992
|
|
Total
|
$ 16,916
|
|
|
$ 20,464
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Level 2 Fair Value
|
in thousands
|
2016
|
|
|
2015
|
|
Fair Value Recurring
|
|
|
|
|
|
Rabbi Trust
|
|
|
|
|
|
Money market mutual fund
|
$ 1,705
|
|
|
$ 2,124
|
|
Total
|
$ 1,705
|
|
|
$ 2,124
|
|
|
Fair Value Measurement on Nonrecurring Basis |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Year ending December 31, 2016
|
|
Year ending December 31, 2015
|
|
|
|
|
|
|
Impairment
|
|
|
|
|
|
Impairment
|
|
in thousands
|
Level 2
|
|
|
Charges
|
|
|
Level 2
|
|
|
Charges
|
|
Fair Value Nonrecurring
|
|
|
|
|
|
|
|
|
|
|
|
Property, plant & equipment
|
$ 0
|
|
|
$ 1,359
|
|
|
$ 0
|
|
|
$ 2,176
|
|
Other intangible assets, net
|
0
|
|
|
8,180
|
|
|
0
|
|
|
2,858
|
|
Other assets
|
0
|
|
|
967
|
|
|
0
|
|
|
156
|
|
Totals
|
$ 0
|
|
|
$ 10,506
|
|
|
$ 0
|
|
|
$ 5,190
|
|
|
Reconciliation of Deferred Revenue Balances |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
in thousands
|
2016
|
|
|
2015
|
|
|
2014
|
|
Deferred Revenue
|
|
|
|
|
|
|
|
|
Balance at beginning of year
|
$ 214,060
|
|
|
$ 219,968
|
|
|
$ 224,743
|
|
Cash received and revenue deferred
|
0
|
|
|
0
|
|
|
187
|
|
Amortization of deferred revenue
|
(7,592)
|
|
|
(5,908)
|
|
|
(4,962)
|
|
Balance at end of year
|
$ 206,468
|
|
|
$ 214,060
|
|
|
$ 219,968
|
|
|
Unrecognized Compensation Expense |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Unrecognized
|
|
|
Expected
|
|
|
|
Compensation
|
|
|
Weighted-average
|
|
dollars in thousands
|
Expense
|
|
|
Recognition (Years)
|
|
Share-based Compensation
|
|
|
|
|
|
SOSARs 1
|
$ 4,899
|
|
|
1.8
|
|
Performance shares
|
20,965
|
|
|
2.4
|
|
Restricted shares
|
4,925
|
|
|
2.6
|
|
Total/weighted-average
|
$ 30,789
|
|
|
2.3
|
|
|
|
1
|
Stock-Only Stock Appreciation Rights (SOSARs)
|
|
Pretax Compensation Expense |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
in thousands
|
2016
|
|
|
2015
|
|
|
2014
|
|
Employee Share-based Compensation Awards
|
|
|
|
|
|
|
|
|
Pretax compensation expense
|
$ 17,823
|
|
|
$ 16,362
|
|
|
$ 22,217
|
|
Income tax benefits
|
6,925
|
|
|
6,347
|
|
|
8,571
|
|
|
Liabilities Under Self-Insurance Program |
|
|
|
|
|
|
|
|
|
|
|
|
dollars in thousands
|
2016
|
|
|
2015
|
|
Self-insurance Program
|
|
|
|
|
|
Self-insured liabilities (undiscounted)
|
$ 49,310
|
|
|
$ 44,618
|
|
Insured liabilities (undiscounted)
|
72,644
|
|
|
16,787
|
|
Discount rate
|
1.40%
|
|
|
1.44%
|
|
Amounts Recognized in Consolidated
|
|
|
|
|
|
Balance Sheets
|
|
|
|
|
|
Other accounts and notes receivable
|
$ 67,631
|
|
|
$ 0
|
|
Investments and long-term receivables
|
16,133
|
|
|
15,810
|
|
Other current liabilities
|
(69,549)
|
|
|
(14,198)
|
|
Other noncurrent liabilities
|
(49,074)
|
|
|
(44,102)
|
|
Net liabilities (discounted)
|
$ (34,859)
|
|
|
$ (42,490)
|
|
|
Estimated Payments (Undiscounted) Under Self-Insurance Program |
|
|
|
|
|
|
in thousands
|
|
|
Estimated Payments under Self-insurance Program
|
|
|
2017
|
$ 74,027
|
|
2018
|
13,599
|
|
2019
|
8,767
|
|
2020
|
5,461
|
|
2021
|
3,716
|
|
|
Weighted-Average Common Shares Outstanding Assuming Dilution |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
in thousands
|
2016
|
|
|
2015
|
|
|
2014
|
|
Weighted-average common shares outstanding
|
133,205
|
|
|
133,210
|
|
|
131,461
|
|
Dilutive effect of
|
|
|
|
|
|
|
|
|
Stock options/SOSARs
|
1,339
|
|
|
1,027
|
|
|
656
|
|
Other stock compensation plans
|
1,246
|
|
|
856
|
|
|
874
|
|
Weighted-average common shares outstanding,
|
|
|
|
|
|
|
|
|
assuming dilution
|
135,790
|
|
|
135,093
|
|
|
132,991
|
|
|
Antidilutive Common Stock Equivalents |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
in thousands
|
2016
|
|
|
2015
|
|
|
2014
|
|
Antidilutive common stock equivalents
|
97
|
|
|
544
|
|
|
2,352
|
|
|