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Accounts Receivable | 12 Months Ended
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Dec. 31, 2020
Receivables [Abstract] |
Accounts Receivable | Accounts Receivable Accounts receivable consisted of the following at December 31:
(in thousands) |  | 2020 |  | 2019
Contract receivables |  | $ | 382,096 |  |  | $ | 385,744 |
Other |  | 5,538 |  |  | 6,099 |
|  | 387,634 |  |  | 391,843 |
Less: allowance for doubtful accounts |  | (1,696) |  |  | (3,364) |
|  | $ | 385,938 |  |  | $ | 388,479 |
The roll-forward of activity in the allowance for doubtful accounts was as follows for the years ended December 31:
(in thousands) |  | 2020 |  | 2019 |  | 2018
Balance at beginning of period |  | $ | 3,364 |  |  | $ | 1,331 |  |  | $ | 605 |
Less: reduction in (provision for) allowances |  | 1,296 |  |  | (2,532) |  |  | (860) |
Less: write offs, net of recoveries |  | 375 |  |  | 501 |  |  | 123 |
Change in foreign currency translation |  | (3) |  |  | (2) |  |  | 11 |
Balance at end of period |  | $ | 1,696 |  |  | $ | 3,364 |  |  | $ | 1,331 |

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- Definition The entire disclosure for claims held for amounts due a entity, excluding financing receivables. Examples include, but are not limited to, trade accounts receivables, notes receivables, loans receivables. Includes disclosure for allowance for credit losses. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -URI http://asc.fasb.org/subtopic&trid=2196772 + Details
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- References No definition available. + Details
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