Significant Accounting Policies - Goodwill and Indefinite-lived Intangible Assets (Details) - USD ($)			12 Months Ended
	Oct. 31, 2019	Oct. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Nov. 01, 2013
Business Acquisition [Line Items]
Goodwill acquired			$ 26,563,000	$ 33,899,000
Impairment of goodwill	$ 0	$ 0	7,336,000	$ 0	$ 0
HCN
Business Acquisition [Line Items]
Goodwill acquired						$ 38,600,000
Indefinite-lived intangible assets acquired						$ 3,700,000
Impairment of goodwill	$ 1,500,000		$ 7,300,000