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Income taxes (Tables) | 12 Months Ended
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Dec. 31, 2019
Income Tax Disclosure [Abstract] |
Provision (Benefit) for Income Taxes on Income from Continuing Operations | The provision (benefit) for income taxes from continuing operations consists of the following (in thousands):
2019 | Current |  | Deferred |  | Total
Federal | $ | 59,791 |  |  | $ | 21,345 |  |  | $ | 81,136 |
State and other | 7,567 |  |  | 719 |  |  | 8,286 |
Total | $ | 67,358 |  |  | $ | 22,064 |  |  | $ | 89,422 |
2018 | Current |  | Deferred |  | Total
Federal | $ | 77,795 |  |  | $ | 15,765 |  |  | $ | 93,560 |
State and other | 9,527 |  |  | 4,280 |  |  | 13,807 |
Total | $ | 87,322 |  |  | $ | 20,045 |  |  | $ | 107,367 |
2017 | Current |  | Deferred |  | Total
Federal | $ | 81,355 |  |  | $ | (214,539 | ) |  | $ | (133,184 | )
State and other | 7,981 |  |  | (12,043 | ) |  | (4,062 | )
Total | $ | 89,336 |  |  | $ | (226,582 | ) |  | $ | (137,246 | )
Reconciliation of Effective Tax Rate | The provision for income taxes varies from the U.S. federal statutory tax rate as a result of the following differences:
| 2019 |  | 2018 |  | 2017
U.S. statutory tax rate | 21.0% |  | 21.0% |  | 35.0%
Increase (decrease) in taxes resulting from: |  |  |  |  |
State taxes (net of federal income tax benefit) | 3.1 |  | 2.9 |  | 2.4
Domestic manufacturing deduction | — |  | — |  | (3.0)
Uncertain tax positions, settlements and lapse of statutes of limitations | (1.6) |  | (0.3) |  | (0.9)
Valuation allowances, tax rate changes, & other deferred adjustments | (1.7) |  | (1.0) |  | (6.3)
Valuation allowance on equity method investment | 1.7 |  | — |  | —
Enactment of the Tax Cuts and Jobs Act | — |  | (1.1) |  | (70.9)
Non-deductible transactions costs | 0.3 |  | — |  | 1.2
Net excess benefits or expense on share-based payments | 0.4 |  | 0.1 |  | (0.4)
Other, net | 0.6 |  | (0.5) |  | (1.3)
Effective tax rate | 23.8% |  | 21.1% |  | (44.2%)
Deferred Tax Liabilities and Assets | Deferred tax liabilities and assets were composed of the following as of the end of December 31, 2019 and 2018 (in thousands):
| Dec. 31,
| 2019 |  | 2018
Deferred tax liabilities |  |  |
Accelerated depreciation | $ | 62,951 |  |  | $ | 43,396 |
Accelerated amortization of deductible intangibles | 524,697 |  |  | 427,760 |
Right-of-use assets for operating leases | 25,615 |  |  | — |
Other | 3,677 |  |  | 2,655 |
Total deferred tax liabilities | 616,940 |  |  | 473,811 |
Deferred tax assets |  |  |
Accrued compensation costs | 16,180 |  |  | 13,440 |
Pension and post-retirement medical and life | 35,192 |  |  | 34,679 |
Loss carryforwards | 38,686 |  |  | 120,695 |
Operating lease liabilities | 26,008 |  |  | — |
Other | 30,914 |  |  | 34,044 |
Total deferred tax assets | 146,980 |  |  | 202,858 |
Deferred tax asset valuation allowance | 45,661 |  |  | 125,894 |
Total net deferred tax (liabilities) | $ | (515,621 | ) |  | $ | (396,847 | )
The following table summarizes the activity related to deferred tax asset valuation allowances (in thousands):
| 2019 |  | 2018 |  | 2017
Beginning at beginning of period | $ | 125,894 |  |  | $ | 136,418 |  |  | $ | 209,939 |
Additions to valuation allowance | 9,545 |  |  | 3,908 |  |  | 40,180 |
Reductions to valuation allowance | (89,778 | ) |  | (14,432 | ) |  | (113,701 | )
Balance at the end of the period | $ | 45,661 |  |  | $ | 125,894 |  |  | $ | 136,418 |
Summary of Activity Related to Unrecognized Tax Benefits, Excluding Federal Tax Benefit of State Tax Deductions | The following table summarizes the activity related to unrecognized tax benefits, excluding the federal tax benefit of state tax deductions (in thousands):
| 2019 |  | 2018 |  | 2017
Change in unrecognized tax benefits |  |  |  |  |
Balance as of beginning of year | $ | 12,843 |  |  | $ | 15,043 |  |  | $ | 17,300 |
Additions based on tax positions related to the current year | — |  |  | 40 |  |  | 156 |
Additions for tax positions of prior years | — |  |  | 2,631 |  |  | 11 |
Reductions for tax positions of prior years | (959 | ) |  | — |  |  | (636 | )
Settlements | (288 | ) |  | (182 | ) |  | (852 | )
Reductions due to lapse of statutes of limitations | (3,546 | ) |  | (4,689 | ) |  | (936 | )
Balance as of end of year | $ | 8,050 |  |  | $ | 12,843 |  |  | $ | 15,043 |

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- Definition Tabular disclosure of the components of income tax expense attributable to continuing operations for each year presented including, but not limited to: current tax expense (benefit), deferred tax expense (benefit), investment tax credits, government grants, the benefits of operating loss carryforwards, tax expense that results from allocating certain tax benefits either directly to contributed capital or to reduce goodwill or other noncurrent intangible assets of an acquired entity, adjustments of a deferred tax liability or asset for enacted changes in tax laws or rates or a change in the tax status of the entity, and adjustments of the beginning-of-the-year balances of a valuation allowance because of a change in circumstances that causes a change in judgment about the realizability of the related deferred tax asset in future years. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 9 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32639-109319 + Details
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- Definition Tabular disclosure of the reconciliation using percentage or dollar amounts of the reported amount of income tax expense attributable to continuing operations for the year to the amount of income tax expense that would result from applying domestic federal statutory tax rates to pretax income from continuing operations. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32687-109319 + Details
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- Definition Tabular disclosure for tax positions taken in the tax returns filed or to be filed for which it is more likely than not that the tax position will not be sustained upon examination by taxing authorities and other income tax contingencies. Includes, but is not limited to, interest and penalties, reconciliation of unrecognized tax benefits, unrecognized tax benefits that would affect the effective tax rate, tax years that remain subject to examination by tax jurisdictions, and information about positions for which it is reasonably possible that amounts unrecognized will significantly change within 12 months. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15A -URI http://asc.fasb.org/extlink&oid=84230637&loc=SL6600010-109319 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32718-109319 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 19 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32840-109319 + Details
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