Commitments And Contingencies (Narrative) (Details) $ in Thousands		3 Months Ended						12 Months Ended
	Dec. 17, 2018 USD ($) transaction	Dec. 31, 2018 USD ($) claim	Jun. 30, 2018 USD ($)	Dec. 31, 2017 USD ($)	Sep. 30, 2017 USD ($)	Jun. 30, 2017 USD ($)	Mar. 31, 2017 USD ($)	Dec. 31, 2018 USD ($) claim	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)	Dec. 31, 2015 USD ($)
Loss Contingencies [Line Items]
Insurance Settlements Receivable		$ 152,987		$ 213,407				$ 152,987	$ 213,407
Write-off of insurance receivables				9,300	$ 5,300		$ 15,000
Operating lease rent expense								33,600	30,800	$ 33,000
Letters of credit outstanding, amount		239,400		235,500				239,400	235,500
Surety Bonds Outstanding		$ 1,300,000		1,200,000				$ 1,300,000	1,200,000
Charges related to contractual dispute										15,000
Maximum product warranty in years								10 years
Loss Contingency, Pending Claims, Number | claim		1,000						1,000
Self-insurance liabilities		$ 737,013		758,812				$ 737,013	758,812	831,058	$ 924,563
Incurred but not reported percentage of liability reserves		65.00%						65.00%
Adjustment to self insurance reserves			$ 37,900	$ (75,300)		$ (19,800)		$ (35,873)	(97,789)	(57,132)
Reserves provided		$ 16,200						$ 16,130	(50)	$ 506
Florida [Member]
Loss Contingencies [Line Items]
Product Warranty Expense									$ 12,400
CTX Mortgage Company LLC [Member] | Lehman Complaint [Member]
Loss Contingencies [Line Items]
Damages sought, value	$ 261,000
RMBS Transactions - Alleged Violations [Member] | CTX Mortgage Company LLC [Member] | Lehman Complaint [Member]
Loss Contingencies [Line Items]
Loss Contingency, Number Of Transactions | transaction	2
RMBS Transactions - Similar Indemnity Provisions [Member] | CTX Mortgage Company LLC [Member] | Lehman Complaint [Member]
Loss Contingencies [Line Items]
Loss Contingency, Number Of Transactions | transaction	6