Other Current Accounts Receivable (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Other Current Accounts Receivable
Insurance claims receivable	$ 54,922	$ 57,021
Accident loss receivables	1,206	1,448
Other current receivables	1,025	1,023
Total other current accounts receivable	$ 57,153	$ 59,492