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Consolidated Statements of Comprehensive Income - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Revenue:      
Revenues $ 204,462 $ 205,594 $ 156,613
Revenues - related party (Note 4) 44,653 36,026 63,731
Total revenues 249,115 241,620 220,344
Expenses:      
Voyage expenses (Note 10) 15,165 9,920 6,479
Voyage expenses - related party (Notes 4, 10) 0 360 411
Vessel operating expenses (Note 10) 74,516 66,637 58,625
Vessel operating expenses - related party (Notes 4, 10) 11,629 10,866 11,708
General and administrative expenses (Note 4) 6,234 6,253 6,608
Vessel depreciation and amortization (Note 5) 73,993 71,897 62,707
Impairment of vessel (Notes 5, 8) 3,282 0 0
Operating income 64,296 75,687 73,806
Other income / (expense), net:      
Interest expense and finance cost (Note 7) (26,605) (24,302) (20,143)
Other income 792 1,104 1,747
Total other expense, net (25,813) (23,198) (18,396)
Partnership's net income 38,483 52,489 55,410
Preferred unit holders' interest in Partnership's net income 11,101 11,101 11,334
General Partner's interest in Partnership's net income 522 818 879
Common unit holders' interest in Partnership's net income $ 26,860 $ 40,570 $ 43,197
Net income per (Note 14):      
Common unit, basic and diluted $ 0.22 $ 0.34 $ 0.38
Weighted-average units outstanding:      
Common units, basic and diluted 123,845,345 119,803,329 115,030,879
Total Partnership's comprehensive income: $ 38,483 $ 52,489 $ 55,410