Revenue Recognition - Narrative (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Revenue Remaining Performance Obligation Expected Timing Of Satisfaction [Line Items]
Unbilled receivables	$ 145,349	$ 140,534
Performance obligation	76,500
Receivables (Included in Trade Receivables)
Revenue Remaining Performance Obligation Expected Timing Of Satisfaction [Line Items]
Unbilled receivables	$ 106,300	$ 83,200