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Voyage revenues | 6 Months Ended
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Jun. 30, 2019
Disaggregation of Revenue [Abstract] |
Voyage revenues: | 15. Voyage revenues: The following table shows the voyage revenues earned from time charters, voyage charters and pool agreements for the six month periods ended June 30, 2018 and 2019, as presented in the consolidated statement of operation:
| Six months period ended
| 2018 |  | 2019
Time charters | $ | 152,079 | $ | 176,709
Voyage charters |  | 99,029 |  | 145,443
Pool revenues |  | 2,553 |  | 2,130
| $ | 253,661 | $ | 324,282
As of June 30, 2019, trade accounts receivable, net increased by $3,392, and deferred revenue increased by $4,916 compared to December 31, 2018. These changes were mainly attributable to the timing of collections. Further, as of June 30, 2019, deferred assets related to revenue contracts (included within “Other current assets”) increased by $492 compared to December 31, 2018, from $2,054 to $2,546. This change was mainly attributable to the increase in the number of the voyage contracts in progress as of June 30, 2019 and the timing of commencement of revenue recognition. Under ASC 606, unearned voyage charter revenue represents the consideration received for undelivered performance obligations. The Company recorded $10,855 as unearned revenue related to voyages in progress as of December 31, 2018, which were recognized in earnings in the six month period ended June 30, 2019 as the performance obligations were satisfied in that period.

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- Definition The entire disclosure of revenue from contract with customer to transfer good or service and to transfer nonfinancial asset. Includes, but is not limited to, disaggregation of revenue, credit loss recognized from contract with customer, judgment and change in judgment related to contract with customer, and asset recognized from cost incurred to obtain or fulfill contract with customer. Excludes insurance and lease contracts. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -URI http://asc.fasb.org/topic&trid=49130388 + Details
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