Details of Certain Accounts

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



	June 30, 2018		December 31, 2017

Contract assets (Note 9)	$	727	$	—
Note receivable ⁽¹⁾	2,000		—
Prepaids	15,426		10,102
Deferred costs (Note 9)	27,275		27,204
Other	6,091		4,462
Total other current assets	$	51,519	$	41,768

(1)

The note receivable in the form of convertible bonds was issued to us by a customer as part of a payment forgiveness arrangement and was acquired from us by a third party on July 6, 2018. The fair value of the bonds at June 30, 2018 reflects the amount that we received from the sale. The bonds were previously scheduled to mature on December 14, 2019. The fair value of the bonds at December 31, 2017 is reflected in “Other assets, net” (see below). During the six-month period ended June 30, 2018, we reversed a $0.6 million unrealized gain previously recorded in Accumulated OCI and recorded a $1.1 million other than temporary loss to account for the reduction in the fair value of these bonds.

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



	June 30, 2018		December 31, 2017

Note receivable	$	—	$	3,758
Prepaids	6,788		7,666
Deferred dry dock costs, net	10,732		12,368
Deferred costs (Note 9)	51,089		63,767
Charter fee deposit ⁽¹⁾	12,544		12,544
Other	4,670		5,102
Total other assets, net	$	85,823	$	105,205


(1)	This amount deposited with the vessel owner is to be used to reduce our final charter payments for the Siem Helix 2.

Accrued liabilities consist of the following (in thousands):



	June 30, 2018		December 31, 2017

Accrued payroll and related benefits	$	35,245	$	30,685
Deferred revenue (Note 9)	14,438		12,609
Derivative liability (Note 15)	10,157		10,625
Other	21,247		17,761
Total accrued liabilities	$	81,087	$	71,680

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



	June 30, 2018		December 31, 2017

Investee losses in excess of investment (Note 5)	$	6,518	$	7,567
Deferred gain on sale of property ⁽¹⁾	5,466		5,838
Deferred revenue (Note 9)	20,169		8,744
Derivative liability (Note 15)	3,353		8,150
Other	11,193		10,391
Total other non-current liabilities	$	46,699	$	40,690


(1)	Relates to the sale and lease-back in January 2016 of our office and warehouse property located in Aberdeen, Scotland. The deferred gain is amortized over a 15-year minimum lease term.