Assets Held for Sale - Schedule of assets and liabilities held for sale (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Operating lease right-of-use assets	$ 133,899
Total assets held for sale	50,099	$ 577
Operating lease liabilities	5,767
Total liabilities held for sale	5,767	0
Certain Clinics in Pennsylvania, Ohio, and New Jersey and Other Property and Equipment | Disposal Group, Held-for-sale, Not Discontinued Operations
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Inventories	265
Prepaid expenses and other current assets	20
Property and Equipment, net	11,245
Operating lease right-of-use assets	5,408
Other long-term assets	0
Goodwill	34,184
Valuation allowance on disposal group	(1,023)
Total assets held for sale	50,099
Operating lease liabilities	5,767
Total liabilities held for sale	$ 5,767
Certain Clinics In Maryland | Disposal Group, Held-for-sale, Not Discontinued Operations
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Inventories		64
Prepaid expenses and other current assets		0
Property and Equipment, net		477
Other long-term assets		36
Goodwill		0
Valuation allowance on disposal group		0
Total assets held for sale		577
Total liabilities held for sale		$ 0