Financial Instruments (Tables)

6 Months Ended

Jun. 30, 2017

Investments, All Other Investments [Abstract]

Schedule of Fair Value On a Recurring and Non-recurring Basis

The following table presents information about assets that were recorded at fair value on a recurring basis as of June 30, 2017 and December 31, 2016 and indicate the fair value hierarchy:

	June 30, 2017
(thousands of dollars)	Level 1	Level 2	Level 3	Total
Current Assets
Marketable securities	$             913	$              -	$             -	$            913
Total current assets recorded at fair value	$             913	$              -	$             -	$            913
Non-Current Assets
Restricted cash	3,941	-	-	3,941
Total non-current assets recorded at fair value	$          3,941	$             -	$             -	$         3,941
	December 31, 2016
	Level 1	Level 2	Level 3	Total
Non-Current Assets
Restricted cash	$          3,964	$            -	$             -	$         3,964
Total non-current assets recorded at fair value	$          3,964	$            -	$             -	$         3,964