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Income Taxes (Notes)
12 Months Ended
Dec. 31, 2020
Income Tax Disclosure [Abstract]  
Income Taxes
7.Income Taxes
Deferred taxes reflect the net tax effects of temporary differences between the carrying amounts of assets and liabilities used for financial reporting purposes and the amounts used for income tax purposes.
Significant components of the net deferred tax assets as reflected on the Consolidated Balance Sheets are as follows:
December 31,
(in thousands)20202019
 
Deferred tax liabilities
Prepaid assets$(4,207)$(4,252)
Depreciation(4,941)(4,564)
Software development costs(8,230)(6,475)
Tenant improvements(3,702)(3,209)
Right-of-use leased assets(17,322)(15,949)
Intangibles(1,444)(955)
Total deferred tax liabilities(39,846)(35,404)
Deferred tax assets
Accrued incentive compensation5,092 5,946 
Net operating loss carryforward558 632 
Workers’ compensation accruals6,310 5,404 
Accrued rent1,553 1,223 
Stock-based compensation11,383 6,712 
Operating lease liabilities21,024 19,158 
Minority investment impairment676 673 
Cares act deferral3,235 — 
Other294 287 
Total deferred tax assets50,125 40,035 
Valuation allowance(676)(675)
Total net deferred tax assets49,449 39,360 
Net deferred tax assets$9,603 $3,956 
The components of income tax expense are as follows:
Year Ended December 31,
(in thousands)202020192018
 
Current income tax expense
Federal$45,558 $27,385 $40,347 
State11,122 6,299 11,133 
Total current income tax expense56,680 33,684 51,480 
Deferred income tax (benefit) expense
Federal(4,678)4,016 (3,398)
State(969)844 (1,135)
Total deferred income tax (benefit) expense(5,647)4,860 (4,533)
Total income tax expense$51,033 $38,544 $46,947 

In 2016, we prospectively adopted ASU No. 2016-09, Compensation-Stock Compensation (Topic 718): Improvements to Employee Share-Based Payment Accounting. We recognized an income tax benefit of $2.1 million in 2020, $14.6 million in 2019 and $3.9 million in 2018 related to excess tax benefits from the vesting of equity compensation.
The reconciliation of income tax expense computed at U.S. federal statutory tax rates to the reported income tax expense from continuing operations is as follows:
Year Ended December 31,
(in thousands)202020192018
Expected income tax expense at 21%
$39,747 $39,825 $38,296 
State income taxes, net of federal benefit7,818 5,821 7,660 
Nondeductible expenses3,641 5,959 4,831 
Equity compensation, net1,335 (12,120)(2,737)
Research and development credit(1,479)(1,069)(856)
Other, net(29)128 (247)
Reported total income tax expense$51,033 $38,544 $46,947 

At December 31, 2020, we have net operating loss carryforwards totaling $2.2 million that expire from 2023 to 2030 related to an acquisition that occurred in 2010.

We recognize interest and penalties related to uncertain tax positions in income tax expense. As of December 31, 2020, 2019 and 2018, we made no provisions for interest or penalties related to uncertain tax positions. The tax years 2017 through 2019 remain open to examination by the Internal Revenue Service of the United States. The tax years 2016 through 2019 remain open to examination by various state tax authorities.