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Income Taxes (Tables)
12 Months Ended
Dec. 31, 2016
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:
 
2016
 
2015
 
2014
 
(Dollars in thousands)
Domestic
$
212,987

 
$
222,188

 
$
273,487

Foreign
18,930

 
30,698

 
11,065

Total
$
231,917

 
$
252,886

 
$
284,552

Components of Provision for Income Taxes
The components of the provision for income taxes were as follows:
 
 
2016
 
2015
 
2014
 
(Dollars in thousands)
Current:
 
 
 
 
 
Federal
$
27,805

 
$
77,777

 
$
51,399

State
(577
)
 
7,972

 
4,487

Foreign
6,327

 
8,002

 
7,519

Current income tax provision
33,555

 
93,751

 
63,405

Deferred:
 
 
 
 
 
Federal
42,964

 
(10,065
)
 
38,879

State
3,445

 
(1,932
)
 
2,958

Foreign
(1,398
)
 
(1,281
)
 
(3,081
)
Deferred income tax provision (benefit)
45,011

 
(13,278
)
 
38,756

 
$
78,566

 
$
80,473

 
$
102,161

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:
 
2016
 
2015
 
2014
 
(Dollars in thousands)
Income taxes computed at the statutory
    U.S. federal income tax rate
$
81,171

 
$
88,512

 
$
99,597

State income taxes, net of federal tax benefit
4,264

 
4,903

 
8,165

Tax liabilities (no longer required) required
(408
)
 
2,342

 
815

Valuation allowance
474

 
1,441

 
(3,747
)
Manufacturing exemption
(3,613
)
 
(7,849
)
 
(5,798
)
Tax credit refunds, net
(2,676
)
 
(2,325
)
 
(2,163
)
Foreign earnings taxed at other than 35%
(2,334
)
 
(6,383
)
 
5,957

Deferred tax rate changes
(371
)
 
163

 
(1,327
)
Other
2,059

 
(331
)
 
662

 
$
78,566

 
$
80,473

 
$
102,161

 
 
 
 
 
 
Effective tax rate
33.9
%
 
31.8
%
 
35.9
%
Significant Components of Deferred Tax Assets and Liabilities
Significant components of our deferred tax assets and liabilities at December 31 were as follows:
 
2016
 
2015
 
(Dollars in thousands)
Deferred tax assets:
 
 
 
Pension and other postretirement liabilities
$
14,678

 
$
11,000

Rationalization and other accrued liabilities
22,933

 
25,306

Property, plant and equipment
331

 
1,053

AMT and other credit carryforwards
1,449

 
1,733

Net operating loss carryforwards
21,605

 
26,357

Other intangible assets
821

 
1,025

Foreign currency translation
426

 
236

Inventory and related reserves
16,824

 
27,176

Other
3,482

 
5,337

Total deferred tax assets
82,549

 
99,223

Deferred tax liabilities:
 
 
 
Property, plant and equipment
(208,409
)
 
(192,372
)
Pension and other postretirement liabilities
(30,414
)
 
(18,268
)
Other intangible assets
(81,209
)
 
(81,650
)
Foreign currency translation
(22,156
)
 
(21,697
)
Other
(9,292
)
 
(4,200
)
Total deferred tax liabilities
(351,480
)
 
(318,187
)
Valuation allowance
(8,147
)
 
(8,648
)
 
$
(277,078
)
 
$
(227,612
)
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:
 
2016
 
2015
 
(Dollars in thousands)
Balance at January 1,
$
50,337

 
$
48,143

Increase based upon tax positions of current year
5,955

 
3,853

Increase based upon tax positions of a prior year
217

 
988

Increase (decrease) due to acquisitions
1,810

 
(1,327
)
Decrease based upon settlements with taxing authorities
(1,159
)
 

Decrease based upon a lapse in the statute of limitations
(439
)
 
(1,320
)
Balance at December 31,
$
56,721

 
$
50,337