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Income Taxes (Tables)
12 Months Ended
Dec. 31, 2020
Income Tax Disclosure [Abstract]  
Components of Income Before Provision for Income Taxes
The components of income before provision for income taxes consisted of the following (dollars in thousands):

Year Ended December 31,
202020192018
Domestic$470,181 $839,899 $807,590 
Foreign499,788 521,446 571,416 
$969,969 $1,361,345 $1,379,006 
Tax Provision (Benefit)
Our tax provision (benefit) consisted of the following (dollars in thousands):

Year Ended December 31,
202020192018
Federal:
Current$18,951 $(51,980)$166,024 
Deferred61,034 (74,432)(7,667)
79,985 (126,412)158,357 
State:
Current33,291 52,403 43,320 
Deferred3,872 (5,760)(3,692)
37,163 46,643 39,628 
Foreign:
Current88,994 163,833 149,194 
Deferred7,959 (14,169)(34,121)
96,953 149,664 115,073 
$214,101 $69,895 $313,058 
Reconciliation of Pre-Tax Income
The following is a reconciliation stated as a percentage of pre-tax income of the U.S. statutory federal income tax rate to our effective tax rate:

Year Ended December 31,
202020192018
Federal statutory tax rate21 %21 %21 %
Foreign rate differential— — 
State taxes, net of federal benefit
Non-deductible expenses
Reserves for uncertain tax positions— — 
Credits and exemptions(2)(4)(2)
Outside basis differences recognized as a result of a legal entity restructuring
— (20)— 
Tax Reform— — 
Change in valuation allowance— — (1)
Acquisition-related costs— — (2)
Other(1)(1)
Effective tax rate22 %%23 %
Temporary Tax Effects
Cumulative tax effects of temporary differences are shown below (dollars in thousands):

December 31,
20202019
Asset (Liability)
Tax losses and tax credits$334,303 $330,839 
Operating lease liabilities358,066 320,261 
Bonus and deferred compensation295,690 280,747 
Bad debt and other reserves73,061 66,504 
Pension obligation18,026 24,022 
Investments17,506 5,236 
Tax effect on revenue items related to Topic 606 adoption(16,784)(25,620)
Property and equipment(88,595)(54,370)
Unconsolidated affiliates and partnerships(59,544)(63,594)
Capitalized costs and intangibles(313,099)(277,246)
Operating lease assets(366,671)(314,433)
All other6,181 (1,153)
Net deferred tax assets before valuation allowance258,140 291,193 
Valuation allowance(291,096)(251,922)
Net deferred tax (liabilities) assets$(32,956)$39,271 
Unrecognized Tax Benefits
A reconciliation of the beginning and ending amount of unrecognized tax benefits is as follows (dollars in thousands):

Year Ended December 31,
20202019
Beginning balance, unrecognized tax benefits$(141,164)$(94,962)
Gross increases - tax positions in prior period(31,070)(22,229)
Gross decreases - tax positions in prior period1,530 17,390 
Gross increases - current-period tax positions(9,688)(45,262)
Decreases relating to settlements— 218 
Reductions as a result of lapse of statute of limitations11,791 3,680 
Foreign exchange movement85 
Ending balance, unrecognized tax benefits$(168,516)$(141,164)