Commitments and Contingencies (Narrative) (Details) $ in Thousands		3 Months Ended		6 Months Ended
	Dec. 17, 2018 USD ($) party	Jun. 30, 2019 USD ($) claim	Jun. 30, 2018 USD ($)	Jun. 30, 2019 USD ($) claim	Jun. 30, 2018 USD ($)	Mar. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)	Mar. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)
Loss Contingencies [Line Items]
Loss contingency accrual		$ 25,500		$ 25,500			$ 50,300
Letters of credit outstanding		253,600		253,600			239,400
Surety bonds outstanding		$ 1,300,000		$ 1,300,000			1,300,000
Maximum product warranty in years				10 years
Number of individual claims managed | claim		1,000		1,000
Self-insurance liabilities		$ 716,218	$ 725,482	$ 716,218	$ 725,482	$ 729,170	$ 737,013	$ 771,104	$ 758,812
Incurred but not reported percentage of liability reserves		68.00%		68.00%			65.00%
Adjustments to previously recorded reserves		$ (12,763)	$ (37,529)	$ (16,638)	$ (35,068)
Write-off of insurance receivables				24,200
ROU assets		72,200		72,200
Operating lease liabilities		95,706		95,706
Additional ROU assets under operating leases		1,000		8,800
Payments on lease liabilities		5,700		11,500
Total lease expense		9,100		17,900
Variable lease costs		1,600		3,200
Short-term lease costs		2,600		4,800
Other Assets
Loss Contingencies [Line Items]
Recorded insurance receivables		$ 104,700		$ 104,700			$ 153,000
Lehman Complaint | CTX Mortgage Company LLC
Loss Contingencies [Line Items]
Number of mortgage originators involved in bankruptcy claim | party	100
Damages sought, value	$ 261,000