Receivables - Changes in Allowance for Credit Losses (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Balance at beginning of period	$ 6,007	$ 10,034
Cumulative effect of accounting change	5,753	8,548
Credit loss expense	1,304	1,044
Write-offs, net of recoveries	(2,517)	(2,530)
Balance at end of period	5,753	8,548
Cumulative effect of accounting change
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Balance at beginning of period	959	0
Cumulative effect of accounting change	$ 959	$ 0