Business, Basis of Presentation and Significant Accounting Policies (Narrative) (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2020 USD ($) numberOfSegments	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)
Business, Basis Of Presentation And Significant Accounting Policies [Line Items]
Number of reportable segments | numberOfSegments	5
Valuation allowances for inventory	$ 8,500	$ 7,700
Cash held by proportionately consolidated entities	423,118	71,427
Financing costs incurred	8,900	5,500
Amortization of deferred financing costs	3,000	2,900	$ 2,900
Deferred financing costs, net of accumulated amortization	16,000	12,400
Accrued payroll taxes	59,000
4.875% Senior Notes [Member] | Senior Notes [Member]
Business, Basis Of Presentation And Significant Accounting Policies [Line Items]
Write off of deferred debt issuance cost	$ 2,300
Debt instrument, interest rate (percentage)	4.875%
4.50% Senior Notes [Member] | Senior Notes [Member]
Business, Basis Of Presentation And Significant Accounting Policies [Line Items]
Debt instrument, interest rate (percentage)	4.50%
Loans Receivable [Member]
Business, Basis Of Presentation And Significant Accounting Policies [Line Items]
Financing arrangement	$ 3,000
Financing receivable	3,000
Self-Insurance [Member] | Workers' Compensation Policy [Member]
Business, Basis Of Presentation And Significant Accounting Policies [Line Items]
Per claim deductible, insurance policies	2,000
Self-Insurance [Member] | General Liability Policy [Member]
Business, Basis Of Presentation And Significant Accounting Policies [Line Items]
Per claim deductible, insurance policies	4,000
Self-Insurance [Member] | Property Insurance Policy [Member] | Automobile Liability [Member]
Business, Basis Of Presentation And Significant Accounting Policies [Line Items]
Per claim deductible, insurance policies	10,000
Self-Insurance [Member] | Employee Group Medical Claims Policy [Member]
Business, Basis Of Presentation And Significant Accounting Policies [Line Items]
Loss contingency, maximum loss per employee	600
Proportionately Consolidated Non-Controlled Joint Venture [Member]
Business, Basis Of Presentation And Significant Accounting Policies [Line Items]
Cash held by proportionately consolidated entities	$ 8,200	$ 13,100
Maximum [Member]
Business, Basis Of Presentation And Significant Accounting Policies [Line Items]
Lease, term of contract	8 years
Facility Leases [Member] | Minimum [Member]
Business, Basis Of Presentation And Significant Accounting Policies [Line Items]
Lease, renewal term	1 year
Facility Leases [Member] | Maximum [Member]
Business, Basis Of Presentation And Significant Accounting Policies [Line Items]
Lease, renewal term	5 years
Equipment Leases [Member] | Minimum [Member]
Business, Basis Of Presentation And Significant Accounting Policies [Line Items]
Lease, renewal term	1 year
Equipment Leases [Member] | Maximum [Member]
Business, Basis Of Presentation And Significant Accounting Policies [Line Items]
Lease, renewal term	5 years