Commitments and Contingencies (Narrative) (Details) $ in Thousands		3 Months Ended		6 Months Ended
	Dec. 17, 2018 USD ($) party	Jun. 30, 2020 USD ($) claim	Jun. 30, 2019 USD ($)	Jun. 30, 2020 USD ($) claim	Jun. 30, 2019 USD ($)	Mar. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)	Mar. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)
Loss Contingencies [Line Items]
Loss contingency accrual		$ 25,300		$ 25,300			$ 25,200
Letters of credit outstanding		244,800		244,800			262,800
Surety bonds outstanding		$ 1,300,000		$ 1,300,000			1,400,000
Maximum product warranty in years				10 years
Number of individual claims managed | claim		1,000		1,000
Self-insurance liabilities		$ 640,014	$ 716,218	$ 640,014	$ 716,218	$ 719,172	$ 709,798	$ 729,170	$ 737,013
Incurred but not reported percentage of liability reserves		69.00%		69.00%			68.00%
Adjustments to previously recorded reserves		$ (60,662)	(12,763)	$ (59,362)	(16,638)
Write-off of insurance receivables			12,600		24,200
ROU assets		76,700		76,700			$ 70,000
Operating lease liabilities		98,113		98,113			91,400
Additional ROU assets under operating leases		3,400	1,000	13,000	8,800
Payments on lease liabilities		4,200	5,700	10,100	11,500
Total lease expense		8,800	9,100	18,700	17,900
Variable lease costs		1,500	1,600	3,400	3,200
Short-term lease costs		1,800	$ 2,600	4,000	$ 4,800
Other Assets
Loss Contingencies [Line Items]
Recorded insurance receivables		$ 82,400		$ 82,400			$ 118,400
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