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Significant Payors (Narrative) (Details) - USD ($) $ in Thousands		3 Months Ended		6 Months Ended		12 Months Ended
	Aug. 04, 2017	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016	Dec. 31, 2016
Concentration Risk [Line Items]
Accounts receivable		$ 137,967		$ 137,967		$ 116,999
Delayed Payments From State Of Illinois [Member]
Concentration Risk [Line Items]
Accounts receivable		$ 73,800		$ 73,800
Delayed Payments From State Of Illinois [Member] \| Subsequent Event [Member]
Concentration Risk [Line Items]
Aggregate delayed payments received	$ 69,400
Service Revenues, Net [Member] \| Illinois Department On Aging [Member]
Concentration Risk [Line Items]
Concentration risk, percentage		36.70%	43.50%	36.60%	44.10%
Accounts Receivable [Member] \| Illinois Department On Aging [Member]
Concentration Risk [Line Items]
Concentration risk, percentage				56.40%		55.40%