BASIS OF PRESENTATION, CONSOLIDATION AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Foreign Currency Exposure (Details)	Dec. 31, 2018	Dec. 31, 2017
One British pound sterling into U.S. dollars | Quarter To Date [Member]
Schedule of Foreign Currency [Line Items]
Foreign currency exchange rates	1.27	1.35
One British pound sterling into U.S. dollars | Year To Date
Schedule of Foreign Currency [Line Items]
Foreign currency exchange rates	1.27	1.35
One euro into U.S. dollars | Quarter To Date [Member]
Schedule of Foreign Currency [Line Items]
Foreign currency exchange rates	1.14	1.20
One euro into U.S. dollars | Year To Date
Schedule of Foreign Currency [Line Items]
Foreign currency exchange rates	1.14	1.20
One Australian dollar into U.S. dollars | Quarter To Date [Member]
Schedule of Foreign Currency [Line Items]
Foreign currency exchange rates	0.70	0.78
One Australian dollar into U.S. dollars | Year To Date
Schedule of Foreign Currency [Line Items]
Foreign currency exchange rates	0.70	0.78
One Norwegian kroner into U.S. dollars | Quarter To Date [Member]
Schedule of Foreign Currency [Line Items]
Foreign currency exchange rates	0.1155	0.1223
One Norwegian kroner into U.S. dollars | Year To Date
Schedule of Foreign Currency [Line Items]
Foreign currency exchange rates	0.1155	0.1223
One Nigerian naira into U.S. dollars | Quarter To Date [Member]
Schedule of Foreign Currency [Line Items]
Foreign currency exchange rates	0.0028	0.0028
One Nigerian naira into U.S. dollars | Year To Date
Schedule of Foreign Currency [Line Items]
Foreign currency exchange rates	0.0028	0.0028
High | One British pound sterling into U.S. dollars | Quarter To Date [Member]
Schedule of Foreign Currency [Line Items]
Foreign currency exchange rates	1.32	1.35
High | One British pound sterling into U.S. dollars | Year To Date
Schedule of Foreign Currency [Line Items]
Foreign currency exchange rates	1.43	1.36
High | One euro into U.S. dollars | Quarter To Date [Member]
Schedule of Foreign Currency [Line Items]
Foreign currency exchange rates	1.16	1.20
High | One euro into U.S. dollars | Year To Date
Schedule of Foreign Currency [Line Items]
Foreign currency exchange rates	1.24	1.20
High | One Australian dollar into U.S. dollars | Quarter To Date [Member]
Schedule of Foreign Currency [Line Items]
Foreign currency exchange rates	0.74	0.79
High | One Australian dollar into U.S. dollars | Year To Date
Schedule of Foreign Currency [Line Items]
Foreign currency exchange rates	0.78	0.81
High | One Norwegian kroner into U.S. dollars | Quarter To Date [Member]
Schedule of Foreign Currency [Line Items]
Foreign currency exchange rates	0.1227	0.1269
High | One Norwegian kroner into U.S. dollars | Year To Date
Schedule of Foreign Currency [Line Items]
Foreign currency exchange rates	0.1290	0.1294
High | One Nigerian naira into U.S. dollars | Quarter To Date [Member]
Schedule of Foreign Currency [Line Items]
Foreign currency exchange rates	0.0028	0.0028
High | One Nigerian naira into U.S. dollars | Year To Date
Schedule of Foreign Currency [Line Items]
Foreign currency exchange rates	0.0028	0.0033
Average | One British pound sterling into U.S. dollars | Quarter To Date [Member]
Schedule of Foreign Currency [Line Items]
Foreign currency exchange rates	1.29	1.33
Average | One British pound sterling into U.S. dollars | Year To Date
Schedule of Foreign Currency [Line Items]
Foreign currency exchange rates	1.32	1.31
Average | One euro into U.S. dollars | Quarter To Date [Member]
Schedule of Foreign Currency [Line Items]
Foreign currency exchange rates	1.14	1.18
Average | One euro into U.S. dollars | Year To Date
Schedule of Foreign Currency [Line Items]
Foreign currency exchange rates	1.17	1.15
Average | One Australian dollar into U.S. dollars | Quarter To Date [Member]
Schedule of Foreign Currency [Line Items]
Foreign currency exchange rates	0.72	0.77
Average | One Australian dollar into U.S. dollars | Year To Date
Schedule of Foreign Currency [Line Items]
Foreign currency exchange rates	0.74	0.77
Average | One Norwegian kroner into U.S. dollars | Quarter To Date [Member]
Schedule of Foreign Currency [Line Items]
Foreign currency exchange rates	0.1183	0.1225
Average | One Norwegian kroner into U.S. dollars | Year To Date
Schedule of Foreign Currency [Line Items]
Foreign currency exchange rates	0.1215	0.1219
Average | One Nigerian naira into U.S. dollars | Quarter To Date [Member]
Schedule of Foreign Currency [Line Items]
Foreign currency exchange rates	0.0027	0.0028
Average | One Nigerian naira into U.S. dollars | Year To Date
Schedule of Foreign Currency [Line Items]
Foreign currency exchange rates	0.0028	0.0030
Low | One British pound sterling into U.S. dollars | Quarter To Date [Member]
Schedule of Foreign Currency [Line Items]
Foreign currency exchange rates	1.25	1.31
Low | One British pound sterling into U.S. dollars | Year To Date
Schedule of Foreign Currency [Line Items]
Foreign currency exchange rates	1.25	1.24
Low | One euro into U.S. dollars | Quarter To Date [Member]
Schedule of Foreign Currency [Line Items]
Foreign currency exchange rates	1.13	1.16
Low | One euro into U.S. dollars | Year To Date
Schedule of Foreign Currency [Line Items]
Foreign currency exchange rates	1.13	1.06
Low | One Australian dollar into U.S. dollars | Quarter To Date [Member]
Schedule of Foreign Currency [Line Items]
Foreign currency exchange rates	0.70	0.75
Low | One Australian dollar into U.S. dollars | Year To Date
Schedule of Foreign Currency [Line Items]
Foreign currency exchange rates	0.70	0.74
Low | One Norwegian kroner into U.S. dollars | Quarter To Date [Member]
Schedule of Foreign Currency [Line Items]
Foreign currency exchange rates	0.1136	0.1193
Low | One Norwegian kroner into U.S. dollars | Year To Date
Schedule of Foreign Currency [Line Items]
Foreign currency exchange rates	0.1136	0.1152
Low | One Nigerian naira into U.S. dollars | Quarter To Date [Member]
Schedule of Foreign Currency [Line Items]
Foreign currency exchange rates	0.0027	0.0028
Low | One Nigerian naira into U.S. dollars | Year To Date
Schedule of Foreign Currency [Line Items]
Foreign currency exchange rates	0.0027	0.0027