Other Assets - Unbilled Receivables Allowance for Credit Losses (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2020 USD ($)
Unbilled Receivables, Allowance For Credit Losses [Roll Forward]
Balance at January 1, 2020	$ (1,228)
Provision for credit losses	(506)
Write-offs	391
Recoveries	0
Balance at March 31, 2020	$ (1,343)