Income Taxes	12 Months Ended
	Dec. 31, 2021
Income Taxes [Abstract]
Income Taxes	11. Income Taxes Our income tax expense for the years ended December 31, 2021, 2020 and 2019 comprises the following current and deferred amounts (in thousands): Year Ended December 31, 2021 2020 2019Current Federal $ 120,448 $ 51,741 $ 9,113State and local 30,871 14,203 7,354Total current 151,319 65,944 16,467Deferred Federal (7,151) (1,375) 2,528State and local (1,550) (486) 646Total deferred (8,701) (1,861) 3,174Income tax expense $ 142,618 $ 64,083 $ 19,641 Total income tax expense differed from the amounts computed by applying the federal statutory income tax rate of 21% for the years ended December 31, 2021, 2020, and 2019, to income before income taxes as a result of the following items (in thousands): Year Ended December 31, 2021 2020 2019Statutory income tax expense $ 134,636 $ 56,730 $ 27,844State income tax expense, net of federal income tax expense 24,123 11,153 5,483Executive compensation 3,520 4,566 4,123Excess tax benefits upon vesting of share based payment awards (764) (108) (252)Federal energy credits (16,451) (8,549) (17,256)State tax credits (1,220) (900) —Other (1,226) 1,191 (301)Income tax expense $ 142,618 $ 64,083 $ 19,641 Income tax expense for the years ended December 31, 2021, 2020, and 2019 was impacted by benefits of $16.5 million, $8.5 million, and $17.3 million, respectively, associated with the Energy Efficient Home Credit under Internal Revenue Code Section 45L (which we refer to as “Federal Energy Credits”). The Federal Energy Credits provide eligible contractors a federal income tax credit of $2,000 for each home delivered that meets the energy saving and certification requirements under the statute. On December 27, 2020, an extension of the Federal Energy Credits was enacted into law, extending the current provisions through December 31, 2021, and no similar legislation has been enacted as of the date of this Form 10-K, and it is uncertain whether an extension or similar tax credit will be adopted or available in the future or the scope of any modified program requirements.Deferred income tax assets and liabilities are recognized for the future tax consequences of temporary differences. Temporary differences arise when revenues and expenses for financial reporting are recognized for tax purposes in a different period. ASC 740 requires that a valuation allowance be recorded against deferred tax assets unless it is more likely than not that the deferred tax assets will be utilized. As a result of this analysis, the Company has not recorded a valuation allowance against its deferred tax assets. The Company will continue to evaluate the need to record valuation allowances against deferred tax assets and will make adjustments in accordance with the accounting standard. The tax effects of temporary differences that give rise to significant portions of the deferred tax assets and liabilities at December 31, 2021 and 2020 (in thousands): As of December 31, 2021 2020Deferred tax assets Warranty reserves $ 3,265 $ 3,389Stock-based compensation 770 841Accrued compensation and other 16,151 9,949Inventories, additional costs capitalized for tax 6,959 2,028Lease liabilities 4,433 4,245Other 2,205 1,794Deferred tax asset 33,783 22,246 Deferred tax liabilities Prepaid expenses (246) (141)Property and equipment (4,801) (4,658)Mortgage servicing rights (3,352) (1,009)Right of use assets (4,145) (3,988)Deferred tax liability (12,544) (9,796)Net deferred tax asset $ 21,239 $ 12,450 The uncertainty provisions of ASC 740 also require the Company to recognize the impact of a tax position in its consolidated financial statements only if the technical merits of that position indicate that the position is more likely than not of being sustained upon audit. During the years ended December 31, 2021 and 2020, the Company did not record a reserve for uncertain tax positions. We file income tax returns in the U.S. federal jurisdiction and various state jurisdictions. We are subject to U.S. federal income tax and various state income tax examinations for calendar tax years ending 2016 through 2021.