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Accounts Receivable (Tables) | 12 Months Ended
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Dec. 31, 2019
Accounts Receivable |
Schedule of accounts receivable | Accounts receivable consisted of the following at December 31:
(in thousands) |  | 2019 |  | 2018
Contract receivables |  | $ | 385,744 |  | $ | 282,283
Other |  |  | 6,099 |  |  | 7,475
|  |  | 391,843 |  |  | 289,758
Less: allowance for doubtful accounts |  |  | (3,364) |  |  | (1,331)
|  | $ | 388,479 |  | $ | 288,427
Schedule of allowance for doubtful accounts | The roll-forward of activity in the allowance for doubtful accounts was as follows for the years ended December 31:
(in thousands) |  | 2019 |  | 2018 |  | 2017
Balance at beginning of period |  | $ | 1,331 |  | $ | 605 |  | $ | 432
Less: reduction in (provision for) allowances |  |  | (2,532) |  |  | (860) |  |  | (263)
Less: write offs, net of recoveries |  |  | 501 |  |  | 123 |  |  | 92
Change in foreign currency translation |  |  | (2) |  |  | 11 |  |  | (2)
Balance at end of period |  | $ | 3,364 |  | $ | 1,331 |  | $ | 605

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- Definition Tabular disclosure of the various types of trade accounts and notes receivable and for each the gross carrying value, allowance, and net carrying value as of the balance sheet date. Presentation is categorized by current, noncurrent and unclassified receivables. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.3,4) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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