Receivables - Changes in Allowance for Credit Losses (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Balance at beginning of period	$ 6,007	$ 10,034
Cumulative effect of accounting change	6,755	9,473
Credit loss expense	726	789
Write-offs, net of recoveries	(937)	(1,350)
Balance at end of period	6,755	9,473
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