XML 88 R54.htm IDEA: XBRL DOCUMENT v3.21.1
Risk Management and Fair Value Measurements - Schedule of Assets Measured at Fair Value on a Non-recurring Basis Long Lived Assets Held and Used and Held for Sale (Details)
$ in Thousands
12 Months Ended
Dec. 31, 2018
USD ($)
Significant Other Observable Inputs (Level 2) Northsea Alpha [Member]  
Impaired Long-Lived Assets Held and Used [Line Items]  
Fair value of vessel $ 6,125
Impairment Loss charged against Vessels, net 1,142
Significant Other Observable Inputs (Level 2) Northsea Beta [Member]  
Impaired Long-Lived Assets Held and Used [Line Items]  
Fair value of vessel 6,125
Impairment Loss charged against Vessels, net 1,140
Significant Other Observable Inputs (Level 2) Northsea Alpha and Northsea Beta [Member]  
Impaired Long-Lived Assets Held and Used [Line Items]  
Fair value of vessel 12,250
Impairment Loss charged against Vessels, net $ 2,282