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Income Taxes - Summary of Components of Deferred Tax Assets and Liabilities (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Deferred tax assets    
Allowance for expected credit losses $ 14,676 $ 13,041
Accrued vacation and bonus 30,694 27,438
Share-based compensation 13,522 12,647
Notes receivable from employees 13,333 12,187
State net operating loss carryforward 2,090 2,066
Foreign net operating loss carryforward 9,437 9,388
Federal tax credit and capital loss carryforward 0 7,336
Deferred compensation 240 2,117
Operating lease assets 41,283 43,397
Employee benefits obligations 2,339 1,191
Other, net 3,701 1,898
Total deferred tax assets 131,315 132,706
Deferred tax liabilities    
Revenue recognition (8,351) (6,732)
Operating lease liabilities (28,523) (29,671)
Property and equipment, net (7,663) (3,797)
Equity debt discount (6,623) (8,890)
Goodwill and intangible assets (202,842) (209,250)
Total deferred tax liabilities (254,002) (258,340)
Foreign withholding tax (1,980) (1,195)
Valuation allowance (13,300) (19,865)
Net deferred tax liabilities $ (137,967) $ (146,694)