Income Taxes	9 Months Ended
	Sep. 30, 2021
Income Tax Disclosure [Abstract]
Income Tax Disclosure [Text Block]	Income TaxesDuring the three months ended September 30, 2021 and 2020, the Company recorded a tax provision of $25.2 million and $21.6 million, respectively, which reflects income tax expense related to the periods’ income before income taxes. The effective tax rate for the three months ended September 30, 2021 and 2020 was 21.7% and 22.7%, respectively. The decrease in the effective rate from the three months ended September 30, 2020 was primarily attributable to a $2.1 million increase in tax benefit from energy efficient home credits. During the nine months ended September 30, 2021 and 2020, the Company recorded a tax provision of $84.3 million and $48.4 million, respectively. The effective tax rate for the nine months ended September 30, 2021 and 2020 was 22.9% and 23.2%, respectively.