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SEGMENT REPORTING - Revenue and Assets (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Revenue and long lived assets                      
Revenue $ 107,806 $ 121,138 $ 117,788 $ 104,475 $ 107,701 $ 122,132 $ 123,245 $ 128,115 $ 451,207 $ 481,193 $ 457,003
Long-Lived Assets 831,538       861,484       831,538 861,484 680,461
U.S                      
Revenue and long lived assets                      
Revenue                 132,288 173,632 198,300
Long-Lived Assets 234,514       358,032       234,514 358,032 265,528
Guyana                      
Revenue and long lived assets                      
Revenue                 102,056 93,524 91,653
Long-Lived Assets 151,084       129,909       151,084 129,909 132,609
U.S. Virgin Islands                      
Revenue and long lived assets                      
Revenue                 79,785 83,194 58,431
Long-Lived Assets 216,173       137,018       216,173 137,018 110,773
Bermuda                      
Revenue and long lived assets                      
Revenue                 103,281 127,244 83,006
Long-Lived Assets 137,992       165,243       137,992 165,243 94,976
Other Foreign Countries                      
Revenue and long lived assets                      
Revenue                 33,797 3,599 25,613
Long-Lived Assets $ 91,774       $ 71,282       $ 91,774 $ 71,282 $ 76,575