Schedule II - Valuation of Qualifying Accounts of Continuing Operations (Schedule of Valuation and Qualifying Accounts) (Details) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Allowance for doubtful accounts
Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at Beginning of Period		$ 10,326	$ 8,180	$ 6,044
Charged to Costs and Expenses		8,958	7,163	7,507
Charged to Other Accounts		0	0	0
Other		0	0	0
(Write-offs) net of Recoveries		(5,049)	(5,017)	(5,371)
Balance at End of Period		14,235	10,326	8,180
Professional Liability Reserve
Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at Beginning of Period		19,977	21,618	25,163
Charged to Costs and Expenses		7,935	6,423	5,213
Charged to Other Accounts	[1]	0	0	1,010
Other		0	114	0
Payments	[2]	(7,855)	(8,178)	(9,768)
Balance at End of Period		20,057	19,977	21,618
Workers Compensation Reserve
Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at Beginning of Period		171	227	250
Charged to Costs and Expenses		995	372	364
Charged to Other Accounts	[1]	0	0	0
Other		0	0	0
Payments	[2]	(299)	(428)	(387)
Balance at End of Period		867	171	227
Health Insurance Reserve
Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at Beginning of Period		1,019	686	687
Charged to Costs and Expenses		13,769	8,896	6,294
Charged to Other Accounts	[1]	0	0	0
Other		0	(137)	0
Payments	[2]	(13,462)	(8,426)	(6,295)
Balance at End of Period		$ 1,326	$ 1,019	$ 686

[1] he Company has presented the results of certain divestiture and lease termination transactions as discontinued operations. The amounts charged to Other Accounts represent the amounts charged to discontinued operations.

[2] Payments for the Professional Liability Reserve include amounts paid for claims settled during the period as well as payments made under structured arrangements for claims settled in earlier periods.