Description of the Business and Summary of Significant Accounting Policies (Intangible Assets) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Finite-Lived Intangible Assets [Line Items]
Intangible Assets, Gross (Excluding Goodwill)	$ 676,186	$ 650,512
Less accumulated amortization	351,609	322,611
Intangible Assets, Net (Excluding Goodwill), Total	324,577	327,901
Amortization of intangible assets	28,999	29,577	$ 27,780
Estimated amortization expense
2021	29,232
2022	27,840
2023	27,439
2024	26,701
2025	24,783
Thereafter	188,582
Total	324,577
Impairment of Long-Lived Tangible and Definite-Lived Intangible Assets
Asset impairment charges	19,409
Corporate Joint Venture [Member]
Impairment of Long-Lived Tangible and Definite-Lived Intangible Assets
Asset impairment charges	19,400
Reduction of net income related to asset impairment	12,000
Other current assets
Impairment of Long-Lived Tangible and Definite-Lived Intangible Assets
Assets held for sale	7,200	8,000
Noncontrolling Interests | Corporate Joint Venture [Member]
Impairment of Long-Lived Tangible and Definite-Lived Intangible Assets
Asset impairment charges	$ 2,400
Weighted average
Finite-Lived Intangible Assets [Line Items]
Useful Life	21 years
Customer, vendor and scrap generator relationships
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Gross	$ 526,886	501,212
Customer, vendor and scrap generator relationships | Minimum
Finite-Lived Intangible Assets [Line Items]
Useful Life	5 years
Customer, vendor and scrap generator relationships | Maximum
Finite-Lived Intangible Assets [Line Items]
Useful Life	25 years
Customer, vendor and scrap generator relationships | Weighted average
Finite-Lived Intangible Assets [Line Items]
Useful Life	21 years
Trade names
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Gross	$ 147,950	147,950
Trade names | Minimum
Finite-Lived Intangible Assets [Line Items]
Useful Life	15 years
Trade names | Maximum
Finite-Lived Intangible Assets [Line Items]
Useful Life	25 years
Trade names | Weighted average
Finite-Lived Intangible Assets [Line Items]
Useful Life	19 years
Other intangible assets
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Gross	$ 1,350	$ 1,350
Useful Life	5 years
Other intangible assets | Weighted average
Finite-Lived Intangible Assets [Line Items]
Useful Life	5 years