Table:
|  | December 31, 2019 | December 31,2018 |
| --- | --- | --- |
| Accounts receivable | $68,309 | $76,376 |
| Less: provision for doubtful receivables | (16,377) | (16,086) |
| Accounts receivable, net | $51,932 | $60,290 |
Paragraphs:
NAVIOS MARITIME HOLDINGS INC. NOTES TO THE CONSOLIDATED FINANCIAL STATEMENTS (Expressed in thousands of U.S. dollars — except share data)
NOTE 5: ACCOUNTS RECEIVABLE, NET
Accounts receivable consisted of the following:
Question:
How many years did Accounts receivable exceed $50,000 thousand?