Significant Payors (Narrative) (Details) - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2017	Mar. 31, 2016	Dec. 31, 2016
Concentration Risk [Line Items]
Accounts receivable	$ 116,174		$ 116,999
Delayed Payments From State Of Illinois [Member]
Concentration Risk [Line Items]
Accounts receivable	58,800
Non-Medicaid [Member] | Delayed Payments From State Of Illinois [Member]
Concentration Risk [Line Items]
Accounts receivable	56,200
Medicaid [Member] | Delayed Payments From State Of Illinois [Member]
Concentration Risk [Line Items]
Accounts receivable	$ 2,600
Service Revenues, Net [Member] | Illinois Department On Aging [Member]
Concentration Risk [Line Items]
Concentration risk, percentage	36.50%	44.80%
Accounts Receivable [Member] | Illinois Department On Aging [Member]
Concentration Risk [Line Items]
Concentration risk, percentage	52.90%		55.40%