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Income Taxes (Tables) | 12 Months Ended
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Dec. 31, 2020
Income Taxes |
Schedule of provision for income taxes relating to continuing operations | Our provision for income taxes relating to continuing operations consists of the following (in thousands):
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | December 31, |
​ |  | 2020 |  | 2019 |  | 2018 |
Current tax provision— | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Federal | ​ | $ | 36,556 | ​ | $ | 33,281 | ​ | $ | 22,728 | ​
State and Puerto Rico | ​ |  | 12,798 | ​ |  | 8,388 | ​ |  | 8,589 | ​
Total current | ​ |  | 49,354 | ​ |  | 41,669 | ​ |  | 31,317 | ​
Deferred tax provision (benefit)— | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Federal | ​ |  | (5,483) | ​ |  | (3,750) | ​ |  | 4,347 | ​
State and Puerto Rico | ​ |  | (2,470) | ​ |  | (501) | ​ |  | 109 | ​
Total deferred | ​ |  | (7,953) | ​ |  | (4,251) | ​ |  | 4,456 | ​
Provision for income taxes | ​ | $ | 41,401 | ​ | $ | 37,418 | ​ | $ | 35,773 | ​
​
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 for income taxes for the years ended December 31, 2020, 2019 and 2018 resulted in effective tax rates on continuing operations of 21.6%, 24.7% and 24.1%, respectively. The reasons for the differences between these effective tax rates and the federal statutory rates are as follows (in thousands):
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | December 31, |
​ |  | 2020 |  | 2019 |  | 2018 |
Federal statutory rate of— | ​ | ​ | 21 | % | ​ | 21 | % | ​ | 21 | %
Income taxes at the federal statutory rate | ​ | $ | 40,223 | ​ | $ | 31,866 | ​ | $ | 31,222 | ​
Increases (decreases) resulting from— | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Net state income taxes | ​ |  | 8,406 | ​ |  | 6,644 | ​ |  | 7,470 | ​
Valuation allowances | ​ |  | (254) | ​ |  | (279) | ​ |  | (2,852) | ​
Net unrecognized tax benefits | ​ |  | 18,557 | ​ |  | 7,338 | ​ |  | (15) | ​
Nondeductible expenses | ​ |  | 2,470 | ​ |  | 2,180 | ​ |  | 1,926 | ​
R&D tax credit | ​ |  | (26,133) | ​ |  | (4,569) | ​ |  | (2,726) | ​
179D deduction | ​ | ​ | (1,062) | ​ | ​ | (5,126) | ​ | ​ | — | ​
Net operating loss carryforwards | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 2,225 | ​
Stock-based compensation deductions | ​ | ​ | (426) | ​ | ​ | (714) | ​ | ​ | (1,293) | ​
Other | ​ |  | (380) | ​ |  | 78 | ​ |  | (184) | ​
Provision for income taxes | ​ | $ | 41,401 | ​ | $ | 37,418 | ​ | $ | 35,773 | ​
Schedule of significant components of the net deferred tax assets and net deferred tax liabilities as reflected on the balance sheet | Significant components of the deferred tax assets and deferred tax liabilities as reflected on the balance sheets are as follows (in thousands):
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Year Ended |
​ | ​ | December 31, |
​ |  | 2020 |  | 2019 |
Deferred tax assets— | ​ | ​ | ​ | ​ | ​ | ​ | ​
Accounts receivable and allowance for credit losses | ​ | $ | 2,186 | ​ | $ | 1,660 | ​
Stock-based compensation | ​ |  | 2,791 | ​ |  | 2,561 | ​
Accrued liabilities and expenses | ​ |  | 39,761 | ​ |  | 25,569 | ​
Lease liabilities | ​ | ​ | 22,768 | ​ | ​ | 20,873 | ​
Net operating loss carryforwards | ​ |  | 12,127 | ​ |  | 2,750 | ​
Intangible assets | ​ | ​ | — | ​ | ​ | 7,988 | ​
Other | ​ |  | 627 | ​ |  | 525 | ​
Subtotal | ​ |  | 80,260 | ​ |  | 61,926 | ​
Valuation allowances | ​ |  | (514) | ​ |  | (369) | ​
Total deferred tax assets | ​ | ​ | 79,746 | ​ | ​ | 61,557 | ​
Deferred tax liabilities— | ​ | ​ | ​ | ​ | ​ | ​ | ​
Property and equipment | ​ |  | (13,877) | ​ |  | (11,286) | ​
Lease right-of-use asset | ​ | ​ | (22,715) | ​ | ​ | (20,873) | ​
Long-term contracts | ​ |  | (609) | ​ |  | (876) | ​
Intangible assets | ​ | ​ | (242) | ​ | ​ | — | ​
Goodwill | ​ |  | (11,615) | ​ |  | (6,020) | ​
Other | ​ |  | (2,626) | ​ |  | (2,004) | ​
Total deferred tax liabilities | ​ |  | (51,684) | ​ |  | (41,059) | ​
Net deferred tax assets | ​ | $ | 28,062 | ​ | $ | 20,498 | ​
Schedule of deferred income tax assets and liabilities included in the consolidated balance sheets | The deferred tax assets and liabilities reflected above are included in the consolidated balance sheets as follows (in thousands):
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | December 31, |
​ |  | 2020 |  | 2019 |
Deferred tax assets | ​ | $ | 29,401 | ​ | $ | 21,923 | ​
Deferred tax liabilities | ​ | $ | 1,339 | ​ | $ | 1,425 | ​
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, |
​ |  | 2020 |  | 2019 |  | 2018 |
Balance at beginning of year | ​ | $ | 10,199 | ​ | $ | 2,966 | ​ | $ | 8,929 | ​
Additions based on tax positions related to current year | ​ |  | — | ​ |  | — | ​ |  | — | ​
Additions based on tax positions related to prior years | ​ |  | 26,858 | ​ |  | 7,473 | ​ |  | 2,726 | ​
Reductions for tax positions related to prior years | ​ |  | — | ​ |  | (240) | ​ |  | (8,689) | ​
Reductions for settlements with tax authorities | ​ |  | (8,301) | ​ |  | — | ​ |  | — | ​
Balance at end of year | ​ | $ | 28,756 | ​ | $ | 10,199 | ​ | $ | 2,966 | ​

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