Background and Basis of Presentation - Allowance for Uncollectible Accounts Receivable (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Mar. 31, 2020	Jun. 30, 2020	Jun. 30, 2019	Dec. 31, 2019
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Allowance for doubtful accounts	$ 1,900,000		$ 1,900,000		$ 1,500,000
Accounts, Notes, Loans and Financing Receivable [Line Items]
Provision for uncollectible accounts receivable			$ 1,100,000	$ 0
COVID-19
Accounts, Notes, Loans and Financing Receivable [Line Items]
Provision for uncollectible accounts receivable	$ 0	$ 1,000,000.0