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Income Taxes | 12 Months Ended
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Dec. 31, 2015
Income Tax Disclosure [Abstract] |
Income Taxes | Income Taxes Provision for income taxes for the years ended December 31 consists of the following (in thousands):
|  | 2015 |  | 2014 |  | 2013
Current: |  |  |  |  |  |
Federal |  | $ | 363,803 |  |  | $ | 394,904 |  |  | $ | 281,938 |
State |  | 37,811 |  |  | 30,997 |  |  | 23,701 |
Foreign |  | 12,826 |  |  | 20,429 |  |  | 22,093 |
|  | 414,440 |  |  | 446,330 |  |  | 327,732 |
Deferred: |  |  |  |  |  |
Federal |  | (15,474 | ) |  | (5,743 | ) |  | 51,509 |
State |  | (2,264 | ) |  | (3,155 | ) |  | (1,471 | )
Foreign |  | 1,254 |  |  | 1,277 |  |  | 2,542 |
|  | (16,484 | ) |  | (7,621 | ) |  | 52,580 |
Total |  | $ | 397,956 |  |  | $ | 438,709 |  |  | $ | 380,312 |
The components of income before income taxes for the years ended December 31 were as follows (in thousands):
|  | 2015 |  | 2014 |  | 2013
Domestic |  | $ | 1,101,427 |  |  | $ | 1,196,335 |  |  | $ | 1,042,317 |
Foreign |  | 48,736 |  |  | 86,985 |  |  | 71,988 |
Total |  | $ | 1,150,163 |  |  | $ | 1,283,320 |  |  | $ | 1,114,305 |
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:
|  | 2015 |  | 2014 |  | 2013
Provision at statutory rate |  | 35.0 | % |  | 35.0 | % |  | 35.0 | %
State taxes, net of federal benefit |  | 1.8 |  |  | 1.7 |  |  | 1.6 |
Domestic manufacturing deduction |  | (2.1 | ) |  | (2.1 | ) |  | (1.7 | )
Research and development credit |  | (0.4 | ) |  | (0.4 | ) |  | (0.9 | )
Unrecognized tax benefits including interest and penalties |  | 1.1 |  |  | 0.2 |  |  | 0.9 |
Valuation allowance adjustments |  | (0.1 | ) |  | (0.1 | ) |  | (0.3 | )
Tax audit settlements |  | — |  |  | — |  |  | 0.1 |
Adjustments for previously accrued taxes |  | (0.1 | ) |  | (0.3 | ) |  | (0.2 | )
Other |  | (0.6 | ) |  | 0.2 |  |  | (0.4 | )
Provision for income taxes |  | 34.6 | % |  | 34.2 | % |  | 34.1 | %
The principal components of the Company’s deferred tax assets and liabilities as of December 31 include the following (in thousands):
|  | 2015 |  | 2014
Deferred tax assets: |  |  |  |
Accruals not yet tax deductible |  | $ | 129,449 |  |  | $ | 120,817 |
Pension and postretirement benefit plan obligations |  | 126,952 |  |  | 104,723 |
Stock compensation |  | 20,111 |  |  | 21,089 |
Net operating loss carryforward |  | 38,250 |  |  | 41,927 |
Valuation allowance |  | (20,659 | ) |  | (25,462 | )
Other, net |  | 47,039 |  |  | 38,465 |
|  | 341,142 |  |  | 301,559 |
Deferred tax liabilities: |  |  |  |
Depreciation, tax in excess of book |  | (136,340 | ) |  | (128,117 | )
Other |  | (2,419 | ) |  | (5,691 | )
|  | (138,759 | ) |  | (133,808 | )
Total |  | $ | 202,383 |  |  | $ | 167,751 |
The Company reviews its deferred tax asset valuation allowances on a quarterly basis, or whenever events or changes in circumstances indicate that a review is required. In determining the requirement for a valuation allowance, the historical and projected financial results of the legal entity or consolidated group recording the net deferred tax asset is considered, along with any positive or negative evidence such as tax law changes. Since future financial results and tax law may differ from previous estimates, periodic adjustments to the Company’s valuation allowances may be necessary. At December 31, 2015, the Company had approximately $339.4 million state net operating loss carry-forwards expiring in 2031. At December 31, 2015 the Company also had Wisconsin research and development credit carryforwards of $13.1 million expiring in 2028. The Company had a deferred tax asset of $26.0 million as of December 31, 2015 for the benefit of these losses and credits. The Company has foreign net operating losses (NOL) totaling $12.2 million as of December 31, 2015. It has a valuation allowance of $20.7 million against the NOLs as well as other associated deferred tax assets of $8.5 million. 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):
|  | 2015 |  | 2014
Unrecognized tax benefits, beginning of period |  | $ | 64,200 |  |  | $ | 63,057 |
Increase in unrecognized tax benefits for tax positions taken in a prior period |  | 9,149 |  |  | 900 |
Decrease in unrecognized tax benefits for tax positions taken in a prior period |  | (1,993 | ) |  | (4,989 | )
Increase in unrecognized tax benefits for tax positions taken in the current period |  | 6,302 |  |  | 5,876 |
Statute lapses |  | (2,465 | ) |  | — |
Settlements with taxing authorities |  | (2,093 | ) |  | (644 | )
Unrecognized tax benefits, end of period |  | $ | 73,100 |  |  | $ | 64,200 |
The amount of unrecognized tax benefits as of December 31, 2015 that, if recognized, would affect the effective tax rate was $56.9 million. The total gross amount of expense related to interest and penalties associated with unrecognized tax benefits recognized during 2015 in the Company’s Consolidated Statements of Income was $3.7 million. The total gross amount of interest and penalties associated with unrecognized tax benefits recognized at December 31, 2015 in the Company’s Consolidated Balance Sheets was $28.7 million. The Company does not expect a significant increase or decrease to the total amounts of unrecognized tax benefits related to continuing operations during the fiscal year ending December 31, 2016. However, the Company is under regular audit by tax authorities. The Company believes that it has appropriate support for the positions taken on its tax returns and that its annual tax provision includes amounts sufficient to pay any assessments. Nonetheless, the amounts ultimately paid, if any, upon resolution of the issues raised by the taxing authorities may differ materially from the amounts accrued for each year. The Company or one of its subsidiaries files income tax returns in the United States federal and Wisconsin state jurisdictions and various other state and foreign jurisdictions. The Company is no longer subject to income tax examinations for Wisconsin state income taxes before 2011 or for United States federal income taxes before 2012.

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- Definition The entire disclosure for income taxes. Disclosures may include net deferred tax liability or asset recognized in an enterprise's statement of financial position, net change during the year in the total valuation allowance, approximate tax effect of each type of temporary difference and carryforward that gives rise to a significant portion of deferred tax liabilities and deferred tax assets, utilization of a tax carryback, and tax uncertainties information. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(h)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32559-109319 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32718-109319 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 9 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32639-109319 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32537-109319 + Details
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