Summary of Significant Accounting Policies - Accounts Receivable and Doubtful Accounts (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
	Sep. 30, 2020	Sep. 30, 2020	Sep. 30, 2020	Sep. 30, 2019
Accounting Policies [Abstract]
Maximum amount available to be sold under agreement			$ 140,000
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Beginning Balance	$ 29,658	$ 15,083
Charged to Costs and Expenses	(1,103)	13,504
Write-Offs Net of Recoveries	(154)	(186)
Ending Balance	28,401	28,401
Prepaid Expense and Other Current Assets, Allowance for Credit Loss [Roll Forward]
Beginning Balance	7,359	0
Charged to Costs and Expenses	9	7,368
Write-Offs Net of Recoveries	0	0
Ending Balance	7,368	7,368
Allowance for doubtful accounts receivable	$ 28,401	$ 15,083	$ 28,401	$ 16,500