Receivables - Narrative (Details) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Accounts, Notes, Loans and Financing Receivable [Line Items]
Other receivables	$ 8,742	$ 7,774
Foreign
Accounts, Notes, Loans and Financing Receivable [Line Items]
Other receivables	$ 7,000	$ 6,200