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Income Taxes (Tables) | 12 Months Ended
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Dec. 31, 2022
Income Taxes |
Schedule of provision for income taxes relating to continuing operations | Our provision (benefit) for income taxes relating to continuing operations consists of the following (in thousands):
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | December 31, |
​ |  | 2022 |  | 2021 |  | 2020 |
Current tax provision— | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Federal | ​ | $ | 58,040 | ​ | $ | 31,283 | ​ | $ | 36,556 | ​
State | ​ |  | 26,376 | ​ |  | 8,741 | ​ |  | 12,798 | ​
Total current | ​ |  | 84,416 | ​ |  | 40,024 | ​ |  | 49,354 | ​
Deferred tax provision (benefit)— | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Federal | ​ |  | (80,130) | ​ |  | 6,197 | ​ |  | (5,483) | ​
State | ​ |  | (14,375) | ​ |  | 705 | ​ |  | (2,470) | ​
Total deferred | ​ |  | (94,505) | ​ |  | 6,902 | ​ |  | (7,953) | ​
Provision (benefit) for income taxes | ​ | $ | (10,089) | ​ | $ | 46,926 | ​ | $ | 41,401 | ​
​
Schedule of difference in income taxes provided for and the amounts determined by applying the federal statutory tax rate to income before income taxes results | The provision (benefit) for income taxes for the years ended December 31, 2022, 2021 and 2020 resulted in effective tax rates on continuing operations of (4.3%), 24.7% and 21.6%, respectively. The reasons for the differences between these effective tax rates and the federal statutory rates are as follows (in thousands, except percentages):
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | December 31, |
​ |  | 2022 |  | 2021 |  | 2020 |
Federal statutory rate of— | ​ | ​ | 21 | % | ​ | 21 | % | ​ | 21 | %
Income taxes at the federal statutory rate | ​ | $ | 49,530 | ​ | $ | 39,958 | ​ | $ | 40,223 | ​
Increases (decreases) resulting from— | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Net state income taxes | ​ |  | 9,376 | ​ |  | 7,340 | ​ |  | 8,406 | ​
Valuation allowances | ​ |  | (95) | ​ |  | (39) | ​ |  | (254) | ​
Net unrecognized tax benefits | ​ |  | (17,922) | ​ |  | 640 | ​ |  | 18,557 | ​
Nondeductible expenses | ​ |  | 4,045 | ​ |  | 2,381 | ​ |  | 2,470 | ​
R&D tax credit | ​ |  | (51,398) | ​ |  | — | ​ |  | (26,133) | ​
179D deduction | ​ | ​ | (964) | ​ | ​ | (1,207) | ​ | ​ | (1,062) | ​
Stock-based compensation deductions | ​ | ​ | (872) | ​ | ​ | (2,210) | ​ | ​ | (426) | ​
Other | ​ |  | (1,789) | ​ |  | 63 | ​ |  | (380) | ​
Provision (benefit) for income taxes | ​ | $ | (10,089) | ​ | $ | 46,926 | ​ | $ | 41,401 | ​
​
Schedule of significant components of the net deferred tax assets and net deferred tax liabilities as reflected on the Consolidated Balance Sheets | Significant components of the deferred tax assets and deferred tax liabilities as reflected on the Consolidated Balance Sheets are as follows (in thousands):
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Year Ended |
​ | ​ | December 31, |
​ |  | 2022 |  | 2021 |
Deferred tax assets— | ​ | ​ | ​ | ​ | ​ | ​ | ​
Accounts receivable and allowance for credit losses | ​ | $ | 2,530 | ​ | $ | 1,878 | ​
Stock-based compensation | ​ |  | 3,809 | ​ |  | 3,392 | ​
Accrued liabilities and expenses | ​ | ​ | 34,179 | ​ | ​ | 36,255 | ​
Lease liabilities | ​ |  | 32,048 | ​ |  | 27,944 | ​
Net operating loss carryforwards | ​ | ​ | 5,361 | ​ | ​ | 10,379 | ​
Intangible assets | ​ |  | 9,204 | ​ |  | 3,851 | ​
Research and experimental expenditures | ​ | ​ | 106,002 | ​ | ​ | — | ​
Other | ​ |  | 539 | ​ |  | 758 | ​
Subtotal | ​ |  | 193,672 | ​ |  | 84,457 | ​
Valuation allowances | ​ |  | (379) | ​ |  | (475) | ​
Total deferred tax assets | ​ | ​ | 193,293 | ​ | ​ | 83,982 | ​
Deferred tax liabilities— | ​ | ​ | ​ | ​ | ​ | ​ | ​
Property and equipment | ​ |  | (18,882) | ​ |  | (15,534) | ​
Lease right-of-use asset | ​ | ​ | (32,025) | ​ | ​ | (27,905) | ​
Long-term contracts | ​ |  | (1,870) | ​ |  | (964) | ​
Goodwill | ​ |  | (23,288) | ​ |  | (17,321) | ​
Other | ​ |  | (1,563) | ​ |  | (1,098) | ​
Total deferred tax liabilities | ​ |  | (77,628) | ​ |  | (62,822) | ​
Net deferred tax assets | ​ | $ | 115,665 | ​ | $ | 21,160 | ​
​
Schedule of deferred income tax assets and liabilities included in the consolidated balance sheets | The deferred tax assets and deferred tax liabilities reflected above are included in the Consolidated Balance Sheets as follows (in thousands):
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | December 31, |
​ |  | 2022 |  | 2021 |
Deferred tax assets | ​ | $ | 115,665 | ​ | $ | 22,905 | ​
Deferred tax liabilities | ​ | $ | — | ​ | $ | 1,745 | ​
​
Schedule of reconciliation of the beginning and ending amount of unrecognized tax benefits, excluding accrued interest and penalties | A reconciliation of the beginning and ending amount of unrecognized tax benefits, excluding accrued interest and penalties, is as follows (in thousands):
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Year Ended |
​ | ​ | December 31, |
​ |  | 2022 |  | 2021 |  | 2020 |
Balance at beginning of year | ​ | $ | 29,452 | ​ | $ | 28,756 | ​ | $ | 10,199 | ​
Additions based on tax positions related to current year | ​ |  | 3,420 | ​ |  | 207 | ​ |  | — | ​
Additions based on tax positions related to prior years | ​ |  | 7,427 | ​ |  | 489 | ​ |  | 26,858 | ​
Reductions for tax positions related to prior years | ​ |  | (13) | ​ |  | — | ​ |  | — | ​
Reductions for settlements with taxing authorities | ​ |  | (28,756) | ​ |  | — | ​ |  | (8,301) | ​
Balance at end of year | ​ | $ | 11,530 | ​ | $ | 29,452 | ​ | $ | 28,756 | ​

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