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Income Taxes (Tables)
12 Months Ended
Dec. 31, 2015
Income Tax Disclosure [Abstract]  
Income Before Income Taxes
Income before income taxes was taxed in the following jurisdictions in each of the years ended December 31:
 
2015
 
2014
 
2013
 
(Dollars in thousands)
Domestic
$
222,188

 
$
273,487

 
$
252,961

Foreign
30,698

 
11,065

 
1,757

Total
$
252,886

 
$
284,552

 
$
254,718

Components of Provision for Income Taxes
The components of the provision for income taxes were as follows:
 
 
2015
 
2014
 
2013
 
(Dollars in thousands)
Current:
 
 
 
 
 
Federal
$
77,777

 
$
51,399

 
$
48,905

State
7,972

 
4,487

 
5,954

Foreign
8,002

 
7,519

 
7,321

Current income tax provision
93,751

 
63,405

 
62,180

Deferred:
 
 
 
 
 
Federal
(10,065
)
 
38,879

 
9,559

State
(1,932
)
 
2,958

 
2,637

Foreign
(1,281
)
 
(3,081
)
 
(5,071
)
Deferred income tax (benefit) provision
(13,278
)
 
38,756

 
7,125

 
$
80,473

 
$
102,161

 
$
69,305

Variation of Provision for Income Taxes from Statutory U.S. Federal Income Tax Rate
The provision for income taxes varied from income taxes computed at the statutory U.S. federal income tax rate as a result of the following:
 
2015
 
2014
 
2013
 
(Dollars in thousands)
Income taxes computed at the statutory
    U.S. federal income tax rate
$
88,512

 
$
99,597

 
$
89,151

State income taxes, net of federal tax benefit
4,903

 
8,165

 
7,775

Tax liabilities required (no longer required)
2,342

 
815

 
(17,043
)
Valuation allowance
1,441

 
(3,747
)
 
(5,087
)
Manufacturing exemption
(7,849
)
 
(5,798
)
 
(7,452
)
Tax credit refunds, net
(2,325
)
 
(2,163
)
 
(1,797
)
Foreign earnings taxed at other than 35%
(6,383
)
 
5,957

 
(600
)
Deferred tax rate changes
163

 
(1,327
)
 
2,235

Other
(331
)
 
662

 
2,123

 
$
80,473

 
$
102,161

 
$
69,305

 
 
 
 
 
 
Effective tax rate
31.8
%
 
35.9
%
 
27.2
%
Significant Components of Deferred Tax Assets and Liabilities
Significant components of our deferred tax assets and liabilities at December 31 were as follows:
 
2015
 
2014
 
(Dollars in thousands)
Deferred tax assets:
 
 
 
Pension and other postretirement liabilities
$
11,000

 
$
14,957

Rationalization and other accrued liabilities
25,306

 
14,933

Property, plant and equipment
1,053

 
1,182

AMT and other credit carryforwards
1,733

 
1,500

Net operating loss carryforwards
26,357

 
33,972

Other intangible assets
1,025

 
1,597

Foreign currency translation
236

 
825

Inventory and related reserves
27,176

 
10,604

Other
5,337

 
6,676

Total deferred tax assets
99,223

 
86,246

Deferred tax liabilities:
 
 
 
Property, plant and equipment
(192,372
)
 
(194,793
)
Pension and other postretirement liabilities
(18,268
)
 
(13,383
)
Other intangible assets
(81,650
)
 
(82,150
)
Foreign currency translation
(21,697
)
 
(13,110
)
Other
(4,200
)
 
(3,988
)
Total deferred tax liabilities
(318,187
)
 
(307,424
)
Valuation allowance
(8,648
)
 
(7,858
)
 
$
(227,612
)
 
$
(229,036
)
Reconciliation of Beginning and Ending Amount of Gross Unrecognized Tax Benefits
A reconciliation of the beginning and ending amount of gross unrecognized tax benefits included as other liabilities in our Consolidated Balance Sheets was as follows:
 
2015
 
2014
 
(Dollars in thousands)
Balance at January 1,
$
48,143

 
$
50,398

Increase based upon tax positions of current year
3,853

 
646

Increase based upon tax positions of a prior year
988

 
457

Decrease due to acquisitions
(1,327
)
 
(2,732
)
Decrease based upon settlements with taxing authorities

 
(50
)
Decrease based upon a lapse in the statute of limitations
(1,320
)
 
(576
)
Balance at December 31,
$
50,337

 
$
48,143