Commitments And Contingencies (Narrative) (Details) $ in Thousands	3 Months Ended					12 Months Ended
	Dec. 31, 2020 USD ($) claim	Jun. 30, 2020 USD ($)	Dec. 31, 2019 USD ($)	Sep. 30, 2019 USD ($)	Jun. 30, 2019 USD ($)	Dec. 31, 2020 USD ($) claim	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)
Loss Contingencies [Line Items]
Insurance Settlements Receivable	$ 69,491		$ 118,366			$ 69,491	$ 118,366
Write-off of insurance receivables			12,600		$ 11,600		22,600
Operating lease rent expense							36,400	$ 33,600
Letters of credit outstanding, amount	249,700		262,800			249,700	262,800
Surety Bonds Outstanding	$ 1,500,000		1,400,000			$ 1,500,000	1,400,000
Product Warranty Expense				$ 9,000			14,800
Loss Contingency, Pending Claims, Number | claim	1,000					1,000
Self-insurance liabilities	$ 641,779		$ 709,798			$ 641,779	$ 709,798	737,013	$ 758,812
Incurred but not reported percentage of liability reserves			68.00%				68.00%
Adjustment to self insurance reserves	$ 34,100	$ 60,700				(93,431)	$ (49,437)	(35,873)
Reserves provided						$ 26,410	$ (225)	16,130
Operating Lease, Right-of-Use Asset, Statement of Financial Position [Extensible List]	us-gaap:OtherAssets		us-gaap:OtherAssets			us-gaap:OtherAssets	us-gaap:OtherAssets
Operating Lease, Liability, Statement of Financial Position [Extensible List]	us-gaap:AccountsPayableAndAccruedLiabilitiesCurrentAndNoncurrent		us-gaap:AccountsPayableAndAccruedLiabilitiesCurrentAndNoncurrent			us-gaap:AccountsPayableAndAccruedLiabilitiesCurrentAndNoncurrent	us-gaap:AccountsPayableAndAccruedLiabilitiesCurrentAndNoncurrent
Operating Lease, Right-of-Use Asset	$ 71,273		$ 70,029			$ 71,273	$ 70,029
Operating Lease, Liability	$ 91,365		$ 91,408			91,365	91,408
Right-of-Use Asset Obtained in Exchange for Operating Lease Liability						13,000	17,600
Operating Lease, Payments						19,800	23,400
Lease, Cost						38,200
Variable Lease, Cost						$ 6,200	6,700
Short-term Lease, Cost							$ 9,600	$ 10,200
Unsecured Senior Notes 7.875% Due June 2032 [Member]
Loss Contingencies [Line Items]
Debt instrument, interest rate, stated percentage	7.875%		7.875%			7.875%	7.875%
Unsecured Senior Notes 6.375% Due May 2033 [Member]
Loss Contingencies [Line Items]
Debt instrument, interest rate, stated percentage	6.375%		6.375%			6.375%	6.375%
Unsecured Senior Notes 6.00% Due February 2035 [Member]
Loss Contingencies [Line Items]
Debt instrument, interest rate, stated percentage	6.00%		6.00%			6.00%	6.00%
Unsecured Letter Of Credit Facility [Member]
Loss Contingencies [Line Items]
Letters of credit outstanding, amount	$ 249,700		$ 262,800			$ 249,700	$ 262,800
4.250% unsecured senior notes due March 2021 [Member] | Senior Notes [Member]
Loss Contingencies [Line Items]
Debt instrument, interest rate, stated percentage	4.25%		4.25%			4.25%	4.25%
5.500% unsecured senior notes due March 2026 [Member] | Senior Notes [Member]
Loss Contingencies [Line Items]
Debt instrument, interest rate, stated percentage	5.50%		5.50%			5.50%	5.50%
Senior Unsecured Term Loan Maturing January 3, 2027 [Member] [Domain] | Senior Notes [Member]
Loss Contingencies [Line Items]
Debt instrument, interest rate, stated percentage	5.00%		5.00%			5.00%	5.00%
Other Homebuilding [Member]
Loss Contingencies [Line Items]
Write-off of insurance receivables						$ 17,800