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Income Taxes (Tables) | 12 Months Ended
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Dec. 31, 2021
Income Tax Disclosure [Abstract] |
Provision For Income Taxes | Income tax provision (benefit) for the years ended December 31, consists of the following (in thousands):
| 2021 |  | 2020 |  | 2019
Current: |  |  |  |  |
Federal | $ | 134,111 |  |  | $ | 4,877 |  |  | $ | 82,484 |
State | 14,508 |  |  | 2,614 |  |  | 6,421 |
Foreign | 28,266 |  |  | 19,560 |  |  | 23,328 |
| 176,885 |  |  | 27,051 |  |  | 112,233 |
Deferred: |  |  |  |  |
Federal | (2,169) |  |  | (30,779) |  |  | 18,760 |
State | (3,795) |  |  | (11,579) |  |  | 402 |
Foreign | (1,708) |  |  | (1,721) |  |  | 2,385 |
| (7,672) |  |  | (44,079) |  |  | 21,547 |
| $ | 169,213 |  |  | $ | (17,028) |  |  | $ | 133,780 |
Components Of Income Before Taxes | The components of Income (loss) before income taxes for the years ended December 31, were as follows (in thousands):
| 2021 |  | 2020 |  | 2019
Domestic | $ | 698,578 |  |  | $ | (81,522) |  |  | $ | 465,798 |
Foreign | 120,659 |  |  | 65,792 |  |  | 91,617 |
| $ | 819,237 |  |  | $ | (15,730) |  |  | $ | 557,415 |
Provision For Income Tax Rate To Statutory Rate Reconciliation | Income tax provision (benefit) differs from the amount that would be provided by applying the statutory U.S. corporate income tax rate for the years ended December 31, due to the following items (in thousands):
| 2021 |  | 2020 |  | 2019
Provision (benefit) at statutory rate | $ | 172,040 |  |  | $ | (3,303) |  |  | $ | 117,057 |
State taxes, net of federal benefit | 16,568 |  |  | 822 |  |  | 14,165 |
Foreign rate differential | 4,303 |  |  | 60 |  |  | 1,665 |
Foreign derived intangible income | — |  |  | — |  |  | (3,108) |
Research and development credit | (8,046) |  |  | (8,442) |  |  | (8,200) |
Unrecognized tax benefits including interest and penalties | (6,554) |  |  | (8,567) |  |  | 289 |
Valuation allowance adjustments | (1,928) |  |  | 9,675 |  |  | 8,070 |
State credits | (5,403) |  |  | (13,106) |  |  | (4,704) |
Global intangible low-taxed income | 1,143 |  |  | 1,480 |  |  | 1,113 |
Adjustments for previously accrued taxes | (8,500) |  |  | (4,951) |  |  | (1,755) |
Executive compensation limitation | 3,104 |  |  | 2,543 |  |  | 2,620 |
Other foreign inclusions | 34 |  |  | 4,415 |  |  | 4,202 |
Other | 2,452 |  |  | 2,346 |  |  | 2,366 |
Income tax provision (benefit) | $ | 169,213 |  |  | $ | (17,028) |  |  | $ | 133,780 |
Principal Components Of The Company's Deferred Tax Assets And Liabilities | The principal components of the Company’s deferred income tax assets and liabilities as of December 31, include the following (in thousands):
| 2021 |  | 2020
Deferred income tax assets: |  |  |
Accruals not yet tax deductible | $ | 133,150 |  |  | $ | 142,100 |
Pension and postretirement healthcare plan obligations | — |  |  | 6,499 |
Stock compensation | 10,908 |  |  | 9,619 |
Net operating loss and research & development tax credit carryforwards | 60,401 |  |  | 55,857 |
Other | 66,245 |  |  | 78,051 |
| 270,704 |  |  | 292,126 |
Valuation allowance | (33,596) |  |  | (38,072) |
| 237,108 |  |  | 254,054 |
Deferred income tax liabilities: |  |  |
Depreciation, tax in excess of book | (66,301) |  |  | (74,579) |
Pension and postretirement healthcare plan obligations | (67,741) |  |  | — |
Other | (29,405) |  |  | (29,544) |
| (163,447) |  |  | (104,123) |
| $ | 73,661 |  |  | $ | 149,931 |
Summary of Gross Operating Loss Carryforwards | The Company's gross state net operating loss carryforwards were as follows at December 31, (in thousands):
Year of Expiration |  | 2021 |  | 2020
2031 |  | $ | 236,624 |  |  | $ | 252,142 |
2033 |  | 46 |  |  | 49 |
2034 |  | 112 |  |  | 2,455 |
2035 |  | 7,882 |  |  | 7,800 |
2037 |  | 433 |  |  | — |
2038 |  | 5,601 |  |  | 3,992 |
2039 |  | 13,581 |  |  | 11,710 |
2040 |  | 34,613 |  |  | 29,836 |
2041 |  | 3,486 |  |  | — |
Indefinite |  | 8,441 |  |  | 9,449 |
|  | $ | 310,819 |  |  | $ | 317,433 |
Changes In Gross Liability For Unrecognized Tax Benefits Excluding Interest And Penalties | The Company recognizes interest and penalties related to unrecognized tax benefits in Income tax provision (benefit). Changes in the Company’s gross liability for unrecognized tax benefits, excluding interest and penalties, were as follows (in thousands):
| 2021 |  | 2020
Unrecognized tax benefits, beginning of period | $ | 50,597 |  |  | $ | 60,112 |
Increase in unrecognized tax benefits for tax positions taken in a prior period | 35 |  |  | 1,649 |
Decrease in unrecognized tax benefits for tax positions taken in a prior period | (6,402) |  |  | (12,560) |
Increase in unrecognized tax benefits for tax positions taken in the current period | 3,188 |  |  | 3,092 |
Statute lapses | (2,340) |  |  | — |
Settlements with taxing authorities | (222) |  |  | (1,696) |
Unrecognized tax benefits, end of period | $ | 44,856 |  |  | $ | 50,597 |

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