BUSINESS AND SEGMENT REPORTING (Reportable Segments Information) (Details) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2024 USD ($)	Sep. 30, 2023 USD ($)	Sep. 30, 2024 USD ($) segment	Sep. 30, 2023 USD ($)
Segment Reporting Information [Line Items]
Number of reportable segments | segment			2
Revenues, services	$ 225,190	$ 241,708	$ 757,000	$ 821,041
Time charter equivalent revenues	219,687	235,952	742,463	807,607
Depreciation and amortization	39,304	33,363	109,974	95,356
Gain/(loss) on disposal of vessels and other assets	(13,499)	74	(41,402)	(10,648)
Gain on disposal of vessels and other assets, net of impairments		74
Adjusted income/(loss) from vessel operations	101,869	126,696	409,158	493,136
Adjusted total assets	2,407,010	2,316,053	2,407,010	2,316,053
Expenditures for vessels and vessel improvements			216,589	192,218
Payments for drydocking			43,855	27,622
Time Charter Equivalent Services [Member]
Segment Reporting Information [Line Items]
Revenues, services	219,687
Time charter equivalent revenues		235,952	742,463	807,607
Vessel Operations [Member]
Segment Reporting Information [Line Items]
Gain/(loss) on disposal of vessels and other assets			(41,402)	(10,648)
Adjusted income/(loss) from vessel operations			409,158	493,136
International Crude Tankers Segment [Member]
Segment Reporting Information [Line Items]
Revenues, services	103,212	114,250	355,458	398,829
Depreciation and amortization	20,536	20,039	60,571	56,583
Gain/(loss) on disposal of vessels and other assets	(18)		(20)	38
Gain on disposal of vessels and other assets, net of impairments		13
Adjusted income/(loss) from vessel operations	39,656	58,926	176,696	239,985
Adjusted total assets	1,453,559	1,520,485	1,453,559	1,520,485
Expenditures for vessels and vessel improvements			763	184,515
Payments for drydocking			6,333	4,364
International Crude Tankers Segment [Member] | Time Charter Equivalent Services [Member]
Segment Reporting Information [Line Items]
Revenues, services	98,821
Time charter equivalent revenues		110,766	343,639	388,963
International Product Carriers Segment [Member]
Segment Reporting Information [Line Items]
Revenues, services	121,978	127,458	401,542	422,212
Depreciation and amortization	18,768	13,298	49,403	38,694
Gain/(loss) on disposal of vessels and other assets	(13,481)		(41,382)	(10,686)
Gain on disposal of vessels and other assets, net of impairments		61
Adjusted income/(loss) from vessel operations	62,213	67,796	232,462	253,230
Adjusted total assets	953,451	795,568	953,451	795,568
Expenditures for vessels and vessel improvements			215,826	7,703
Payments for drydocking			37,522	23,258
International Product Carriers Segment [Member] | Time Charter Equivalent Services [Member]
Segment Reporting Information [Line Items]
Revenues, services	120,866
Time charter equivalent revenues		125,186	398,824	418,644
Other Segments [Member]
Segment Reporting Information [Line Items]
Revenues, services	0	0
Depreciation and amortization	0	26		79
Gain/(loss) on disposal of vessels and other assets	0
Gain on disposal of vessels and other assets, net of impairments		0
Adjusted income/(loss) from vessel operations	0	(26)		(79)
Adjusted total assets	0	0	$ 0	$ 0
Other Segments [Member] | Time Charter Equivalent Services [Member]
Segment Reporting Information [Line Items]
Revenues, services	$ 0
Time charter equivalent revenues		$ 0