Details of Certain Accounts

Other current assets consist of the following (in thousands):



	December 31,
	2017		2016

Note receivable ⁽¹⁾	$	—	$	10,000
Prepaids	10,102		13,973
Deferred costs ⁽²⁾	27,204		7,971
Other	4,462		5,444
Total other current assets	$	41,768	$	37,388


(1)	Relates to the balance of the promissory note we received in connection with the sale of our former Ingleside spoolbase in January 2014. Interest on the note was payable quarterly at a rate of 6% per annum. In June 2017, we collected the remaining $10 million principal balance of this note receivable as well as accrued interest.


(2)	Primarily reflects deferred mobilization costs associated with certain long-term contracts, which are to be amortized within 12 months from the balance sheet date (Note 2).

Other assets, net consist of the following (in thousands):



	December 31,
	2017		2016

Note receivable, net ⁽¹⁾	$	3,758	$	2,827
Prepaids	7,666		6,418
Deferred dry dock costs, net (Note 2)	12,368		14,766
Deferred costs ⁽²⁾	63,767		30,738
Charter fee deposit ⁽³⁾	12,544		12,544
Other	5,102		5,256
Total other assets, net	$	105,205	$	72,549

(1)

In 2016, we entered into an agreement with one of our customers to defer their payment obligations to June 30, 2018. On March 30, 2017, we entered into a new agreement with this customer in which we agreed to forgive all but $4.3 million of receivables due from the customer in exchange for its redeemable convertible bonds that approximated that amount. The bonds are redeemable by the customer at any time and the maturity date of the bonds is December 14, 2019. Interest at a rate of 5% per annum is payable annually on the bonds. The amount at December 31, 2017 reflected the fair value of the bonds as of that date (Note 16). The amount at December 31, 2016 was net of allowance of $4.2 million.


(2)	Primarily reflects deferred mobilization costs to be amortized after 12 months from the balance sheet date through the end of the applicable term of certain long-term contracts (Note 2).


(3)	Represents deposit to be used to reduce our final charter payments for the Siem Helix 2.

Accrued liabilities consist of the following (in thousands):



	December 31,
	2017		2016

Accrued payroll and related benefits	$	30,685	$	20,705
Deferred revenue	12,609		8,911
Derivative liability (Note 17)	10,625		18,730
Other	17,761		10,268
Total accrued liabilities	$	71,680	$	58,614

Other non-current liabilities consist of the following (in thousands):



	December 31,
	2017		2016

Investee losses in excess of investment (Note 5)	$	7,567	$	10,238
Deferred gain on sale of property (Note 4)	5,838		5,761
Deferred revenue	8,744		8,598
Derivative liability (Note 17)	8,150		20,191
Other	10,391		8,197
Total other non-current liabilities	$	40,690	$	52,985