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INCOME TAXES
12 Months Ended
Dec. 31, 2020
Income Tax Disclosure [Abstract]  
INCOME TAXES INCOME TAXES
The components of earnings (loss) from continuing operations before income taxes and the provision for (benefit from) income taxes from continuing operations were as follows:
 Years ended December 31,
 202020192018
 (In thousands)
Earnings (loss) from continuing operations before income taxes:
United States$(126,537)$(44,668)$371,925 
Foreign(3,823)2,397 17,544 
Total$(130,360)$(42,271)$389,469 
Provision for (benefit from) income taxes from continuing operations:
Current tax expense (benefit) from continuing operations:
Federal (1)
$(642)$(1,065)$(23,333)
State9,523 9,187 6,862 
Foreign5,620 5,210 10,123 
14,501 13,332 (6,348)
Deferred tax expense (benefit) from continuing operations:
Federal(27,534)(8,228)113,764 
State(10,263)(18,790)1,250 
Foreign4,932 (5,313)(6,119)
(32,865)(32,331)108,895 
Total$(18,364)$(18,999)$102,547 
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(1) The current federal tax benefit in 2018 included $22 million of alternative minimum tax refunds generated by the 2017 Tax Cuts and Jobs Act.

A reconciliation of the federal statutory tax rate with the effective tax rate from continuing operations follows:
 Years ended December 31,
 202020192018
 (Percentage of pre-tax earnings)
 Federal statutory tax rate 21.0 %21.0 %21.0 %
 Impact of one-time deemed repatriation  %— %6.2 %
 Impact on deferred taxes for changes in tax rates 0.9 %20.5 %(3.3)%
 Additional deferred tax adjustments 0.8 %— %(1.5)%
 State income taxes, net of federal income tax benefit (3.4)%(19.2)%3.7 %
 Foreign rates varying from federal statutory tax rate 1.3 %3.1 %0.1 %
 Tax contingencies 5.5 %15.7 %(0.9)%
 Tax credits 1.7 %11.3 %0.2 %
 Other permanent book-tax differences (3.3)%(8.6)%0.8 %
 Change in foreign valuation allowance(11.9)%— %— %
 Other1.5 %1.1 %— %
 Effective tax rate14.1 %44.9 %26.3 %
Tax Reform Impact
On December 22, 2017, the 2017 Tax Cuts and Jobs Act of 2017 (2017 Tax Reform) was signed into law. The 2017 Tax Reform made broad and complex changes to the U.S. tax code which have had a significant impact on our earnings. During 2018, we completed our analyses on the impact of the 2017 Tax Reform and recorded an additional $10 million benefit for the re-measurement of our net deferred tax liability and an additional $24 million expense for the transition tax.
Deferred Income Taxes
The components of the net deferred income tax liability were as follows:
 December 31,
 20202019
 (In thousands)
Deferred income tax assets:
Self-insurance accruals$104,346 $94,690 
Net operating loss carryforwards381,585 619,314 
Accrued compensation and benefits46,321 31,402 
Pension benefits75,466 78,004 
Deferred revenue170,958 146,383 
Other, including federal benefit on state tax positions35,104 30,750 
813,780 1,000,543 
Valuation allowance(41,153)(17,577)
772,627 982,966 
Deferred income tax liabilities:
Property and equipment basis differences(1,888,112)(2,121,842)
Other(5,379)(5,386)
(1,893,491)(2,127,228)
Net deferred income tax liability (1)
$(1,120,864)$(1,144,262)
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(1)Deferred tax assets of $5 million and $17 million have been included in "Sales-type leases and other assets" as of December 31, 2020 and 2019, respectively.

As of December 31, 2020, we have undistributed earnings of foreign subsidiaries of $813 million. We plan to continue to reinvest foreign earnings overseas indefinitely. With respect to the undistributed earnings as of December 31, 2020, $635 million was included in the transition tax. The determination of the amount of any additional unrecognized deferred tax liability is not practicable because of the complexities associated with the hypothetical calculations used in evaluating whether we will maintain the indefinite reinvestment assertion.
As of December 31, 2020, we had U.S. federal tax effected net operating loss carryforwards, before unrecognized tax benefits, of $311 million, of which $8 million is expected to expire beginning 2034 and the remaining portion has an indefinite carryforward period. Various U.S. subsidiaries had state tax effected net operating loss carryforwards, before unrecognized tax benefits and valuation allowances, of $72 million that will begin to expire as follows: $4 million in 2021, $0.4 million in 2022, and $63 million in 2023 and thereafter. The remaining portion has an indefinite carryforward period. To the extent that we do not generate sufficient state taxable income through viable planning strategies within the statutory carryforward periods to utilize the loss carryforwards in these states, the loss carryforwards will expire unused. We also had foreign tax effected net operating loss carryforwards of $30 million that are available to reduce future income tax payments in several countries, subject to varying expiration rules. We assess the realizability of our deferred tax assets and record a valuation allowance to the extent it is determined that they are not more-likely-than-not to be realized. Due to our assessment of future sources of taxable income in various states and foreign jurisdictions, we have a cumulative valuation allowance of $41 million against our deferred tax assets as of December 31, 2020. This includes a $24 million valuation allowance against our U.K. deferred tax assets recorded in 2020, of which $13 million was a discrete item recorded in the first quarter of 2020. The valuation allowance is subject to change in future years based on the availability of future sources of taxable income.
Uncertain Tax Positions
In many cases, our uncertain tax positions are related to tax years that remain subject to examination by the relevant taxing authorities. The following table summarizes these open tax years by jurisdiction:
JurisdictionOpen Tax Year
United States (Federal)2011, 2013 - 2015, 2017 - 2020
Canada2013 - 2020
Mexico2015 - 2020
United Kingdom2019 - 2020
Brazil (in discontinued operations)2015 - 2020

The following table summarizes the activity related to unrecognized tax benefits (excluding the federal benefit received from state positions):
 December 31,
 202020192018
 (In thousands)
Balance at January 1$48,918 $58,819 $62,288 
Additions based on tax positions related to the current year2,225 1,422 3,885 
Reductions due to lapse of applicable statutes of limitation(8,356)(11,323)(7,354)
Gross balance at December 3142,787 48,918 58,819 
Interest and penalties4,491 4,772 4,594 
Balance at December 31$47,278 $53,690 $63,413 
Of the total unrecognized tax benefits as of December 31, 2020, $39 million (net of the federal benefit on state issues) represents the amount of unrecognized tax benefits that, if recognized, would favorably affect the effective tax rate in future periods. Unrecognized tax benefits related to federal, state and foreign tax positions may decrease by $6 million by December 31, 2021, if audits are completed or tax years close during 2021.