Allowance for Credit Losses (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	$ 26,828	$ 22,571	$ 31,193
Additions	32,077	30,092	24,214
Deductions	(25,537)	(25,835)	(25,707)
Ending balance	33,368	26,828	22,571
Accounts receivable, allowance for credit loss	33,000
Contract with customer, asset, allowance for credit loss	300
Accounts receivable, allowance for credit loss, incremental increase (decrease) due to COVID	2,100
Impact of Adoption
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	$ 0	0	(7,129)
Ending balance		$ 0	$ 0