Accounts Receivable and Inventories - Allowance For Credit Losses (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Balance at beginning of the period	$ 3,559	$ 3,384	$ 3,857	$ 3,304
Provision for expected credit losses	731	666	874	1,529
Write-offs and adjustments, net of recoveries	(617)	(911)	(1,058)	(1,694)
Balance at end of the period	$ 3,673	$ 3,139	$ 3,673	$ 3,139