Other Current Assets (Tables)

6 Months Ended

Jun. 30, 2020

Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]

Schedule of other current assets net book value

The following table shows the breakdown in other current assets net book value for the presented periods:

	December 31, 2019		June 30, 2020
	(in thousands)
Prepayments to suppliers	$	5,109	$	5,671
Other debtors	4,225		2,809
Prepaid expenses	7,891		8,437
Derivative instruments	—		389
Gross book value at end of period	17,225		17,306
Net book value at end of period	$	17,225	$	17,306