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Income Taxes (Tables) | 12 Months Ended
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Dec. 31, 2018
Income Tax Disclosure [Abstract] |
Provision For Income Taxes | Provision for income taxes for the years ended December 31 consists of the following (in thousands):
|  | 2018 |  | 2017 |  | 2016
Current: |  |  |  |  |  |
Federal |  | $ | 136,202 |  |  | $ | 245,189 |  |  | $ | 284,489 |
State |  | 23,134 |  |  | 24,898 |  |  | 28,406 |
Foreign |  | 29,823 |  |  | 21,138 |  |  | 19,017 |
|  | 189,159 |  |  | 291,225 |  |  | 331,912 |
Deferred: |  |  |  |  |  |
Federal |  | (23,181 | ) |  | 47,046 |  |  | (4,250 | )
State |  | (6,787 | ) |  | 2,688 |  |  | 7,038 |
Foreign |  | (4,013 | ) |  | 1,121 |  |  | (2,953 | )
|  | (33,981 | ) |  | 50,855 |  |  | (165 | )
Total |  | $ | 155,178 |  |  | $ | 342,080 |  |  | $ | 331,747 |
Components Of Income Before Taxes | The components of income before income taxes for the years ended December 31 were as follows (in thousands):
|  | 2018 |  | 2017 |  | 2016
Domestic |  | $ | 593,099 |  |  | $ | 788,878 |  |  | $ | 954,138 |
Foreign |  | 93,530 |  |  | 74,961 |  |  | 69,773 |
Total |  | $ | 686,629 |  |  | $ | 863,839 |  |  | $ | 1,023,911 |
Provision For Income Tax Rate To Statutory Rate Reconciliation | The provision for income taxes differs from the amount that would be provided by applying the statutory U.S. corporate income tax rate due to the following items for the years ended December 31:
|  | 2018 |  | 2017 |  | 2016
Provision at statutory rate |  | 21.0 | % |  | 35.0 | % |  | 35.0 | %
State taxes, net of federal benefit |  | 2.6 |  |  | 1.9 |  |  | 1.8 |
Foreign rate differential |  | 0.4 |  |  | (0.8 | ) |  | (0.6 | )
Domestic manufacturing deduction |  | — |  |  | (2.2 | ) |  | (2.1 | )
Foreign derived intangible income |  | (1.2 | ) |  | — |  |  | — |
Research and development credit |  | (1.1 | ) |  | (0.7 | ) |  | (0.4 | )
Unrecognized tax benefits including interest and penalties |  | (0.6 | ) |  | 2.3 |  |  | (1.3 | )
Valuation allowance adjustments |  | 0.1 |  |  | (0.1 | ) |  | 0.1 |
Deferred tax balance remeasurement for rate change |  | (1.2 | ) |  | 5.5 |  |  | — |
Territorial tax |  | 1.4 |  |  | (0.1 | ) |  | — |
Global intangible low-taxed income |  | 0.4 |  |  | — |  |  | — |
Adjustments for previously accrued taxes |  | (1.0 | ) |  | (1.2 | ) |  | 0.2 |
Rate differential on intercompany transfers |  | 0.9 |  |  | — |  |  | — |
Executive compensation limitation |  | 0.5 |  |  | — |  |  | — |
Other |  | 0.4 |  |  | — |  |  | (0.3 | )
Provision for income taxes |  | 22.6 | % |  | 39.6 | % |  | 32.4 | %
Principal Components Of The Company's Deferred Tax Assets And Liabilities | The principal components of the Company’s deferred tax assets and liabilities as of December 31 include the following (in thousands):
|  | 2018 |  | 2017
Deferred tax assets: |  |  |  |
Accruals not yet tax deductible |  | $ | 108,284 |  |  | $ | 92,158 |
Pension and postretirement benefit plan obligations |  | 48,347 |  |  | 37,357 |
Stock compensation |  | 13,295 |  |  | 12,669 |
Net operating loss carryforward |  | 34,842 |  |  | 33,171 |
Valuation allowance |  | (21,868 | ) |  | (21,561 | )
Other, net |  | 43,870 |  |  | 52,422 |
|  | 226,770 |  |  | 206,216 |
Deferred tax liabilities: |  |  |  |
Depreciation, tax in excess of book |  | (79,326 | ) |  | (88,989 | )
Other |  | (5,980 | ) |  | (8,154 | )
|  | (85,306 | ) |  | (97,143 | )
Total |  | $ | 141,464 |  |  | $ | 109,073 |
Changes In Gross Liability For Unrecognized Tax Benefits Excluding Interest And Penalties | The Company recognizes interest and penalties related to unrecognized tax benefits in the provision for income taxes. Changes in the Company’s gross liability for unrecognized tax benefits, excluding interest and penalties, were as follows (in thousands):
|  | 2018 |  | 2017
Unrecognized tax benefits, beginning of period |  | $ | 72,230 |  |  | $ | 55,539 |
Increase in unrecognized tax benefits for tax positions taken in a prior period |  | 940 |  |  | 9,513 |
Decrease in unrecognized tax benefits for tax positions taken in a prior period |  | (9,783 | ) |  | (3,749 | )
Increase in unrecognized tax benefits for tax positions taken in the current period |  | 3,355 |  |  | 13,779 |
Settlements with taxing authorities |  | (5,331 | ) |  | (2,852 | )
Unrecognized tax benefits, end of period |  | $ | 61,411 |  |  | $ | 72,230 |

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