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Business and Segment Reporting (Reportable Segments Information) (Details)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2018
USD ($)
Sep. 30, 2017
USD ($)
Sep. 30, 2018
USD ($)
segment
Sep. 30, 2017
USD ($)
Segment Reporting Information [Line Items]        
Number of reportable segments | segment     2  
Shipping revenues $ 60,926 $ 59,968 $ 169,813 $ 220,675
Time charter equivalent revenues 51,253 56,489 150,066 209,901
Depreciation and amortization 19,317 20,528 53,745 58,243
Loss/(gain) on disposal of vessels and other property, including impairments 17,360 5,406 17,193 5,406
Adjusted income/(loss) from vessel operations (13,236) (11,092) (36,383) 13,117
Equity in income of affiliated companies 5,338 12,796 22,500 40,268
Investments in and advances to affiliated companies 275,420 380,718 275,420 380,718
Adjusted total assets 1,757,701 1,647,882 1,757,701 1,647,882
Expenditures for vessels and vessel improvements     135,215 118,369
Payments for drydockings     3,968 19,787
International Crude Tankers Segment [Member]        
Segment Reporting Information [Line Items]        
Shipping revenues 49,920 38,318 123,439 146,124
Time charter equivalent revenues 40,348 34,905 103,953 136,695
Depreciation and amortization 14,848 14,798 39,961 41,149
Loss/(gain) on disposal of vessels and other property, including impairments 17,360 4,565 23,293 4,565
Adjusted income/(loss) from vessel operations (4,641) (5,823) (21,863) 19,672
Equity in income of affiliated companies 4,718 8,901 15,002 29,074
Investments in and advances to affiliated companies 149,387 269,521 149,387 269,521
Adjusted total assets 1,297,101 1,159,936 1,297,101 1,159,936
Expenditures for vessels and vessel improvements     133,756 117,576
Payments for drydockings     3,359 16,005
International Product Carriers Segment [Member]        
Segment Reporting Information [Line Items]        
Shipping revenues 11,006 21,650 46,374 74,551
Time charter equivalent revenues 10,905 21,584 46,113 73,206
Depreciation and amortization 4,434 5,696 13,682 16,994
Loss/(gain) on disposal of vessels and other property, including impairments   841 (6,100) 841
Adjusted income/(loss) from vessel operations (8,560) (5,268) (15,120) (6,406)
Investments in and advances to affiliated companies 13,686 16,651 13,686 16,651
Adjusted total assets 348,253 393,774 348,253 393,774
Expenditures for vessels and vessel improvements     1,459 793
Payments for drydockings     609 3,782
Other Segments [Member]        
Segment Reporting Information [Line Items]        
Depreciation and amortization 35 34 102 100
Adjusted income/(loss) from vessel operations (35) (1) 600 (149)
Equity in income of affiliated companies 620 3,895 7,498 11,194
Investments in and advances to affiliated companies 112,347 94,546 112,347 94,546
Adjusted total assets $ 112,347 $ 94,172 $ 112,347 $ 94,172