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Income Taxes (Tables) | 12 Months Ended
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Dec. 31, 2017
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:
| 2017 |  | 2016 |  | 2015
| (Dollars in thousands)
Domestic | $ | 187,521 |  |  | $ | 212,987 |  |  | $ | 222,188 |
Foreign | 52,160 |  |  | 18,930 |  |  | 30,698 |
Total | $ | 239,681 |  |  | $ | 231,917 |  |  | $ | 252,886 |
Components of Provision for Income Taxes | The components of the (benefit) provision for income taxes were as follows:
| 2017 |  | 2016 |  | 2015
| (Dollars in thousands)
Current: |  |  |  |  |
Federal | $ | 56,834 |  |  | $ | 27,805 |  |  | $ | 77,777 |
State | 7,507 |  |  | (577 | ) |  | 7,972 |
Foreign | 20,650 |  |  | 6,327 |  |  | 8,002 |
Current income tax provision | 84,991 |  |  | 33,555 |  |  | 93,751 |
Deferred: |  |  |  |  |
Federal | (118,919 | ) |  | 42,964 |  |  | (10,065 | )
State | 4,413 |  |  | 3,445 |  |  | (1,932 | )
Foreign | (463 | ) |  | (1,398 | ) |  | (1,281 | )
Deferred income tax (benefit) provision | (114,969 | ) |  | 45,011 |  |  | (13,278 | )
| $ | (29,978 | ) |  | $ | 78,566 |  |  | $ | 80,473 |
Variation of Provision for Income Taxes from Statutory U.S. Federal Income Tax Rate | The (benefit) provision for income taxes varied from income taxes computed at the statutory U.S. federal income tax rate as a result of the following:
| 2017 |  | 2016 |  | 2015
| (Dollars in thousands)
Income taxes computed at the statutory U.S. federal income tax rate | $ | 83,884 |  |  | $ | 81,171 |  |  | $ | 88,512 |
State income taxes, net of federal tax benefit | 4,529 |  |  | 4,264 |  |  | 4,903 |
Tax liabilities required (no longer required) | 1,254 |  |  | (408 | ) |  | 2,342 |
Valuation allowance | 4,636 |  |  | 474 |  |  | 1,441 |
Manufacturing exemption | (5,143 | ) |  | (3,613 | ) |  | (7,849 | )
Tax credit refunds, net | (2,797 | ) |  | (2,676 | ) |  | (2,325 | )
Foreign earnings taxed at other than 35% | (3,840 | ) |  | (2,334 | ) |  | (6,383 | )
Deferred tax rate changes | (114,163 | ) |  | (371 | ) |  | 163 |
Other | 1,662 |  |  | 2,059 |  |  | (331 | )
| $ | (29,978 | ) |  | $ | 78,566 |  |  | $ | 80,473 |
Effective tax rate | (12.5 | )% |  | 33.9 | % |  | 31.8 | %
Significant Components of Deferred Tax Assets and Liabilities | Significant components of our deferred tax assets and liabilities at December 31 were as follows:
| 2017 |  | 2016
| (Dollars in thousands)
Deferred tax assets: |  |  |
Pension and other postretirement liabilities | $ | 21,235 |  |  | $ | 14,678 |
Rationalization and other accrued liabilities | 17,716 |  |  | 22,933 |
Property, plant and equipment | — |  |  | 331 |
AMT and other credit carryforwards | 1,910 |  |  | 1,449 |
Net operating loss carryforwards | 34,102 |  |  | 21,605 |
Other intangible assets | — |  |  | 821 |
Foreign currency translation | 10,170 |  |  | 426 |
Inventory and related reserves | 9,832 |  |  | 16,824 |
Other | 2,093 |  |  | 3,482 |
Total deferred tax assets | 97,058 |  |  | 82,549 |
Deferred tax liabilities: |  |  |
Property, plant and equipment | (175,486 | ) |  | (208,409 | )
Pension and other postretirement liabilities | (23,780 | ) |  | (30,414 | )
Other intangible assets | (115,547 | ) |  | (81,209 | )
Foreign currency translation | — |  |  | (22,156 | )
Other | (3,961 | ) |  | (9,292 | )
Total deferred tax liabilities | (318,774 | ) |  | (351,480 | )
Valuation allowance | (14,089 | ) |  | (8,147 | )
| $ | (235,805 | ) |  | $ | (277,078 | )
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:
| 2017 |  | 2016
| (Dollars in thousands)
Balance at January 1, | $ | 56,721 |  |  | $ | 50,337 |
Increase based upon tax positions of current year | 1,183 |  |  | 5,955 |
(Decrease) increase based upon tax positions of a prior year | (6,839 | ) |  | 217 |
Increase due to acquisitions | — |  |  | 1,810 |
Decrease due to changes in tax rates | (3,408 | ) |  | — |
Decrease based upon settlements with taxing authorities | (2,191 | ) |  | (1,159 | )
Decrease based upon a lapse in the statute of limitations | (320 | ) |  | (439 | )
Balance at December 31, | $ | 45,146 |  |  | $ | 56,721 |

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