Revenue Recognition and Receivables - Schedule of Other Receivables and Advances (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Accounts, Notes, Loans and Financing Receivable [Line Items]
Receivables before the allowance for doubtful accounts	$ 66,257	$ 79,164
Less: allowance for doubtful accounts	0	(14,235)
Accounts receivable, net	66,257	64,929
Medicaid
Accounts, Notes, Loans and Financing Receivable [Line Items]
Receivables before the allowance for doubtful accounts	8,126	9,356
Medicare
Accounts, Notes, Loans and Financing Receivable [Line Items]
Receivables before the allowance for doubtful accounts	15,706	20,007
Managed Care
Accounts, Notes, Loans and Financing Receivable [Line Items]
Receivables before the allowance for doubtful accounts	27,532	29,453
Private Pay and other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Receivables before the allowance for doubtful accounts	14,893	$ 20,348
Calculated under Revenue Guidance in Effect before Topic 606
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accounts receivable, net	83,031
Accounting Standards Update 2014-09 | Calculated under Revenue Guidance in Effect before Topic 606
Accounts, Notes, Loans and Financing Receivable [Line Items]
Receivables before the allowance for doubtful accounts	83,518
Less: allowance for doubtful accounts	(17,261)
Accounts receivable, net	66,257
Accounting Standards Update 2014-09 | Calculated under Revenue Guidance in Effect before Topic 606 | Medicaid
Accounts, Notes, Loans and Financing Receivable [Line Items]
Receivables before the allowance for doubtful accounts	10,229
Accounting Standards Update 2014-09 | Calculated under Revenue Guidance in Effect before Topic 606 | Medicare
Accounts, Notes, Loans and Financing Receivable [Line Items]
Receivables before the allowance for doubtful accounts	17,592
Accounting Standards Update 2014-09 | Calculated under Revenue Guidance in Effect before Topic 606 | Managed Care
Accounts, Notes, Loans and Financing Receivable [Line Items]
Receivables before the allowance for doubtful accounts	30,105
Accounting Standards Update 2014-09 | Calculated under Revenue Guidance in Effect before Topic 606 | Private Pay and other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Receivables before the allowance for doubtful accounts	$ 25,592