(In thousands)	June 30, 2019		December 31, 2018
Due from related parties:
Sonatide (Angola)	$	94,140		109,176
DTDW (Nigeria)		27,819		23,775

Due to related parties:
Sonatide (Angola)	$	27,450		29,347
DTDW (Nigeria)		11,610		5,625

Due from related parties, net of due to related parties	$	82,899		97,979

Amounts due from Sonatide represent cash received by Sonatide from customers and due to us, amounts due from customers that are expected to be remitted to us by Sonatide and costs incurred by us on behalf of Sonatide.

	Six Months
	Ended
(In thousands)	June 30, 2019
Due from Sonatide at December 31, 2018	$	109,176
Revenue earned by the company through Sonatide		29,650
Less amounts received from Sonatide		(35,699	)
Less amounts used to offset Due to Sonatide obligations (A)		(7,982	)
Other		(1,005	)
Total due from Sonatide at June 30, 2019	$	94,140

The amounts due from Sonatide is denominated in U.S. dollars; however, the underlying third-party customer payments to Sonatide were satisfied, in part, in Angolan kwanzas. We and Sonangol, our partner in Sonatide, have had discussions regarding how the net losses from the devaluation of certain Angolan kwanza denominated accounts should be shared.

After offsetting the amounts due to Sonatide, the net amount due from Sonatide at June 30, 2019 was approximately $67.0 million. Sonatide had approximately $51.0 million of cash on hand (approximately $15.0 million denominated in Angolan kwanzas) at June 30, 2019 plus approximately $19.0 million of net trade accounts receivable to satisfy the net due from Sonatide. Given prior discussions with our partner regarding how the net losses from the devaluation of certain Angolan kwanza denominated accounts should be shared, we continue to evaluate our net amount due from Sonatide balance for potential impairment based on available liquidity held by Sonatide.

Amounts due to Sonatide represent commissions payable and other costs paid by Sonatide on behalf of us.

	Six Months
	Ended
(In thousands)	June 30, 2019
Due to Sonatide at December 31, 2018	$	29,347
Plus additional commissions payable to Sonatide		2,828
Plus amounts paid by Sonatide on behalf of the company		5,093
Less commissions paid to Sonatide during the period		(5,961	)
Less amounts used to offset Due from Sonatide obligations (A)		(7,982	)
Other		4,125
Total due to Sonatide at June 30, 2019	$	27,450

Sonatide’s principal earnings are from the commissions paid by us to the joint venture for company vessels chartered in Angola. In addition, Sonatide owns three vessels (one of which is currently stacked) that may generate operating income and cash flow.

Vessel revenues generated by our Angolan operations, percent of consolidated vessel revenues, average number of company owned vessels and average number of stacked company owned vessels of our Angolan operations for the periods indicated were as follows:

	Three Months Ended						Six Months Ended
	June 30, 2019			June 30, 2018			June 30, 2019			June 30, 2018
Revenues of Angolan operations (in thousands)	$	14,272			14,550			29,670			28,719
Percent of consolidated vessel revenues		12	%		14	%		12	%		15	%
Number of company owned vessels in Angola		32			37			34			38
Number of stacked company owned vessels in Angola		13			16			14			17