Income Taxes (Narrative) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Income Tax Examination [Line Items]
Effective tax rate	21.00%	21.00%	21.00%
Tax valuation allowance	$ 0	$ 0
Reserves for uncetain tax positions	0	0
Income tax expense impacted by the benefit from Federal Energy Credits	16,451	$ 8,549	$ 17,256
Federal income tax credit for each home meets the statute	$ 2
Maximum [Member] | Federal [Member]
Income Tax Examination [Line Items]
Income tax year under examination	2021
Minimum [Member] | Federal [Member]
Income Tax Examination [Line Items]
Income tax year under examination	2016