Trade Accounts Receivable - Narrative (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020	Dec. 31, 2020
Receivables [Abstract]
Allowance for credit losses		$ 3,538		$ 4,982
Expense (reversal) of provision	$ 2,200	$ (1,250)	$ 3,700