Goodwill and Other Intangible Assets (Finite-lived Intangible Assets) (Narrative) (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Amortized Intangible Assets [Line Items]
Impairment of Long-Lived Assets	$ 8,087	$ 372	$ 693	$ 0	$ 0	$ 8,109	$ 0	$ 0	$ 9,152	$ 8,109	$ 9,614
Amortization of Intangible Assets
Amortization of intangible assets	13,731	$ 13,572	$ 12,880	$ 13,060	$ 13,362	12,269	$ 11,399	$ 10,384	53,243	$ 47,414	$ 41,187
Estimated amortization of intangible assets, 2020	53,000								53,000
Estimated amortization of intangible assets, 2021	47,000								47,000
Estimated amortization of intangible assets, 2022	41,000								41,000
Estimated amortization of intangible assets, 2023	34,000								34,000
Estimated amortization of intangible assets, 2024	24,000								24,000
Estimated amortization of intangible assets, after 2024	$ 34,000								$ 34,000
Graham Healthcare Group [Member]
Amortized Intangible Assets [Line Items]
Impairment of intangible assets						$ 7,900