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Accounts Receivable - Schedule of accounts receivable (Details) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Accounts Receivable |  |
Contract receivables | $ 385,744 | $ 282,283
Other | 6,099 | 7,475
Accounts receivable, gross current | 391,843 | 289,758
Less: Allowance for doubtful accounts | (3,364) | (1,331)
Accounts receivable, net | $ 388,479 | $ 288,427

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