Basis of Presentation and Significant Accounting Policies (Summary of States in Which Company Generates More Than 5% of its Total Revenues) (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2019 USD ($) Hospital	Mar. 31, 2018 USD ($)
Concentration Risk [Line Items]
Number of hospitals owned or leased | Hospital	27
Total net operating revenues before the provision for bad debts, Amount | $	$ 442,805	$ 486,820
Illinois [Member]
Concentration Risk [Line Items]
Number of hospitals owned or leased | Hospital	8
Total net operating revenues before the provision for bad debts, Amount | $	$ 165,224	$ 187,753
Illinois [Member] | Sales Revenue, Net [Member] | Geographic Concentration Risk [Member]
Concentration Risk [Line Items]
Concentration risk, percentage	39.10%	40.40%
Oregon [Member]
Concentration Risk [Line Items]
Number of hospitals owned or leased | Hospital	1
Total net operating revenues before the provision for bad debts, Amount | $	$ 58,284	$ 55,517
Oregon [Member] | Sales Revenue, Net [Member] | Geographic Concentration Risk [Member]
Concentration Risk [Line Items]
Concentration risk, percentage	13.80%	11.90%
California [Member]
Concentration Risk [Line Items]
Number of hospitals owned or leased | Hospital	2
Total net operating revenues before the provision for bad debts, Amount | $	$ 44,164	$ 44,965
California [Member] | Sales Revenue, Net [Member] | Geographic Concentration Risk [Member]
Concentration Risk [Line Items]
Concentration risk, percentage	10.50%	9.70%
Kentucky [Member]
Concentration Risk [Line Items]
Number of hospitals owned or leased | Hospital	3
Total net operating revenues before the provision for bad debts, Amount | $	$ 29,080	$ 29,290
Kentucky [Member] | Sales Revenue, Net [Member] | Geographic Concentration Risk [Member]
Concentration Risk [Line Items]
Concentration risk, percentage	6.90%	6.30%