Goodwill and Other Intangible Assets (Finite-lived Intangible Assets) (Narrative) (Details) - USD ($) $ in Thousands	3 Months Ended									12 Months Ended
	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Sep. 30, 2018	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Amortized Intangible Assets [Line Items]
Impairment of Long-Lived Assets	$ 342	$ 1,916	$ 11,511	$ 16,401	$ 8,087	$ 372	$ 693	$ 0		$ 30,170	$ 9,152	$ 8,109
Amortization of Intangible Assets
Amortization of intangible assets	14,138	$ 14,150	$ 14,327	$ 14,165	$ 13,731	$ 13,572	$ 12,880	$ 13,060		56,780	$ 53,243	$ 47,414
Estimated amortization of intangible assets, 2021	52,000									52,000
Estimated amortization of intangible assets, 2022	46,000									46,000
Estimated amortization of intangible assets, 2023	38,000									38,000
Estimated amortization of intangible assets, 2024	28,000									28,000
Estimated amortization of intangible assets, 2025	21,000									21,000
Estimated amortization of intangible assets, after 2025	$ 20,000									$ 20,000
Graham Healthcare Group [Member]
Amortized Intangible Assets [Line Items]
Impairment of intangible assets									$ 7,900