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Income Taxes (Tables)
 12 Months Ended
Dec. 31, 2017
Income Tax Disclosure [Abstract]  
Schedule of Income Tax Expense (Benefit)
The following table presents the 2017, 2016 and 2015 income tax expense (benefit):
 
Year Ended December 31
 
2017(1)
 
2016(2)
 
2015(3)
 
(In thousands)
Current income taxes:
 
 
 
 
 
Federal
$
(1,315
)
 
$
49,529

 
$
26,939

State
1,317

 
5,728

 
1,987

Foreign
844

 
879

 
513

Total current income tax expense
846

 
56,136

 
29,439

Deferred income taxes:
 
 
 
 
 
Federal
(38,100
)
 
15,164

 
(34,620
)
State
11,075

 
10,734

 
(48
)
Total deferred income tax expense (benefit)
(27,025
)
 
25,898

 
(34,668
)
Total income tax expense (benefit)
$
(26,179
)
 
$
82,034

 
$
(5,229
)
(1)
Excludes $14.2 million of income tax benefit related to discontinued operations.
(2)
Excludes $0.5 million of income tax expense related to discontinued operations.
(3)
Excludes $0.5 million of income tax expense related to discontinued operations.
Reconciliation of Income Taxes
The following is a reconciliation of income tax expense (benefit) computed at the U.S. federal statutory tax rate to income tax expense (benefit) reported in our Consolidated Statements of Operations:
 
Year Ended December 31
 
2017
 
2016
 
2015
 
Amount
 
Percentage
 
Amount
 
Percentage
 
Amount
 
Percentage
 
(In thousands, except percentages)
Tax expense (benefit) at statutory rate
$
7,435

 
35.0
 %
 
$
70,928

 
35.0
 %
 
$
(4,658
)
 
35.0
 %
State income taxes
1,844

 
8.7

 
9,620

 
4.8

 
3,469

 
(26.1
)
Corporate owned life insurance
(933
)
 
(4.4
)
 
—

 
—

 
(947
)
 
7.1

Nondeductible executive compensation
371

 
1.8

 
1,130

 
0.6

 
851

 
(6.4
)
Change in valuation allowances
5,851

 
27.5

 
1,080

 
0.5

 
(2,209
)
 
16.6

Share-based compensation(1)
2,995

 
14.1

 
—

 
—

 
—

 
—

Domestic production activities deduction
(244
)
 
(1.2
)
 
(4,393
)
 
(2.2
)
 
(2,456
)
 
18.5

Transition tax on unrepatriated foreign earnings
2,106

 
9.9

 
—

 
—

 
—

 
—

Tax reform revaluation of deferred taxes
(45,840
)
 
(215.8
)
 
—

 
—

 
—

 
—

Other
236

 
1.2

 
3,669

 
1.8

 
721

 
(5.4
)
Total
$
(26,179
)
 
(123.2
)%
 
$
82,034

 
40.5
 %
 
$
(5,229
)
 
39.3
 %

(1)
Includes excess tax benefits and deficiencies related to share-based payments recorded in the provision of income taxes because of the adoption of Accounting Standards Update ASU 2016-09 in 2017. See Note 1.
Deferred Income Tax Assets (Liabilities)
The tax effects of temporary differences giving rise to deferred income tax assets (liabilities) were:
 
December 31
 
2017(1)
 
2016(2)
 
(In thousands)
Deferred income tax assets:
 
 
 
Accrued liabilities
$
54,971

 
$
93,491

Retirement plans and postretirement benefits
10,379

 
34,777

Share-based compensation
3,886

 
13,322

Receivables and inventories
6,651

 
8,187

Derivative financial instruments
99

 
—

Net operating loss carryforwards
38,023

 
34,478

Tax credit carryforwards
9,965

 
8,890

Valuation allowances
(21,755
)
 
(12,048
)
 
102,219

 
181,097

Deferred income tax liabilities:
 
 
 
Property, plant and equipment
(124,185
)
 
(208,559
)
Intangible assets
(22,213
)
 
(29,356
)
Derivative financial instruments
—

 
(916
)
Cancellation of debt
(1,708
)
 
(5,576
)
Other
(3,400
)
 
(3,458
)
 
(151,506
)
 
(247,865
)
Net deferred income tax asset (liability)
$
(49,287
)
 
$
(66,768
)
(1)
Includes $7.0 million of deferred tax assets related to uncertain tax positions.
(2)
Includes $8.8 million of deferred tax assets related to uncertain tax positions.
Balance Sheet Classification of Net Deferred Income Tax Assets (Liabilities)
These net deferred income tax assets (liabilities) are classified in our Consolidated Balance Sheets as follows:
 
December 31
 
2017
 
2016
 
(In thousands)
Current assets
$
—

 
$
37,504

Noncurrent assets
10,731

 
21,737

Noncurrent liabilities
(60,018
)
 
(126,009
)
Total
$
(49,287
)
 
$
(66,768
)
Reconciliation of Gross Unrecognized Tax Benefits
The following is a reconciliation of gross unrecognized tax benefits, including interest, recorded in our Consolidated Balance Sheets:
 
December 31
 
2017
 
2016
 
2015
 
(In thousands)
Balance at beginning of year
$
30,410

 
$
27,829

 
$
26,463

Increases in tax positions for current year
251

 
125

 
39

Increases in tax positions for prior years
904

 
4,542

 
1,327

Decreases in tax positions for prior years
(53
)
 
(199
)
 
—

Settlement of tax matters
—

 
(1,887
)
 
—

Lapse of applicable statutes of limitations
(16,458
)
 
—

 
—

Balance at end of year
$
15,054

 
$
30,410

 
$
27,829