Commitments and Contingencies (Narrative) (Details) $ in Thousands		3 Months Ended
	Dec. 17, 2018 USD ($) party	Mar. 31, 2019 USD ($) claim	Dec. 31, 2018 USD ($)	Mar. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)
Loss Contingencies [Line Items]
Loss contingency accrual		$ 25,500	$ 50,300
Letters of credit outstanding		232,900	239,400
Surety bonds outstanding		$ 1,300,000	1,300,000
Maximum product warranty in years		10 years
Number of individual claims managed | claim		1,000
Self-insurance liabilities		$ 729,170	$ 737,013	$ 771,104	$ 758,812
Incurred but not reported percentage of liability reserves		66.00%	65.00%
Write-off of insurance receivables		$ 11,600
ROU assets		73,300
Operating lease liabilities		98,462
Additional ROU assets under operating leases		7,800
Payments on lease liabilities		5,800
Total lease expense		8,800
Variable lease costs		1,700
Other Assets
Loss Contingencies [Line Items]
Recorded insurance receivables		$ 128,000	$ 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