Business Combination - Narrative (Details) - USD ($)		12 Months Ended
	Jan. 08, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Business Acquisition [Line Items]
Acquisition related costs		$ 0
Healthland Holding, Inc.
Business Acquisition [Line Items]
Cash consideration, net of acquired cash received	$ 162,611,000
Number of common shares transferred (in shares)	1,973,880
Number of stock options transferred (in shares)	174,972
Goodwill expected to be tax deductible	$ 23,300,000
Gross contractual amount of accounts receivable	$ 9,400,000
Acquisition related costs, net of severance costs			$ 5,500,000
Severance costs			2,700,000
Healthland Holding, Inc. | General and administrative expenses
Business Acquisition [Line Items]
Acquisition related costs			$ 8,200,000	$ 3,000,000