Current Expected Credit Losses - Changes in the Allowance for Credit Losses (Details)	6 Months Ended
	Jun. 30, 2020 USD ($)
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance, December 31, 2019	$ 11,300,000
Bad debt expense for the six months ended June 30, 2020	5,600,000
Advertising provision adjustment	1,900,000
Write-offs	200,000
Recoveries	0.0
Balance, June 30, 2020	19,700,000
Cumulative Effect, Period Of Adoption, Adjustment
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance, December 31, 2019	700,000
Accounts Receivable
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance, December 31, 2019	700,000
Bad debt expense for the six months ended June 30, 2020	3,900,000
Advertising provision adjustment	2,100,000
Write-offs	100,000
Recoveries	0
Balance, June 30, 2020	7,100,000
Accounts Receivable | Cumulative Effect, Period Of Adoption, Adjustment
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance, December 31, 2019	300,000
Notes receivable, short-term
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance, December 31, 2019	2,400,000
Bad debt expense for the six months ended June 30, 2020	2,000,000.0
Advertising provision adjustment	(200,000)
Write-offs	100,000
Recoveries	0
Balance, June 30, 2020	4,300,000
Notes receivable, short-term | Cumulative Effect, Period Of Adoption, Adjustment
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance, December 31, 2019	0.0
Notes receivable, long-term
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance, December 31, 2019	8,200,000
Bad debt expense for the six months ended June 30, 2020	(700,000)
Advertising provision adjustment	0
Write-offs	0
Recoveries	0
Balance, June 30, 2020	7,600,000
Notes receivable, long-term | Cumulative Effect, Period Of Adoption, Adjustment
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance, December 31, 2019	100,000
Lease Receivables
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance, December 31, 2019	0
Bad debt expense for the six months ended June 30, 2020	100,000
Advertising provision adjustment	0
Write-offs	0
Recoveries	0.0
Balance, June 30, 2020	200,000
Lease Receivables | Cumulative Effect, Period Of Adoption, Adjustment
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance, December 31, 2019	100,000
Equipment Notes
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance, December 31, 2019	0
Bad debt expense for the six months ended June 30, 2020	100,000
Advertising provision adjustment	0
Write-offs	0
Recoveries	0
Balance, June 30, 2020	200,000
Equipment Notes | Cumulative Effect, Period Of Adoption, Adjustment
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance, December 31, 2019	100,000
Other
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance, December 31, 2019	0
Bad debt expense for the six months ended June 30, 2020	200,000
Advertising provision adjustment	0
Write-offs	0
Recoveries	0
Balance, June 30, 2020	300,000
Other | Cumulative Effect, Period Of Adoption, Adjustment
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance, December 31, 2019	$ 100,000