Vessels, net (Tables)

12 Months Ended

Dec. 31, 2020

Property, Plant and Equipment [Abstract]

Vessels, net

Vessels		Cost		Accumulated Depreciation		Net Book Value
Balance December 31, 2017	$	1,420,078	$	(321,063)	$	1,099,015
Additions		115,902		(54,585)		61,317
Disposals		(76,264)		—		(76,264)
Vessels impairment loss		(99,485)		58,667		(40,818)
Balance December 31, 2018	$	1,360,231	$	(316,981)	$	1,043,250
Additions		113,391		(52,088)		61,303
Disposals		(5,696)		81		(5,615)
Vessels impairment loss		(97,170)		60,490		(36,680)
Balance December 31, 2019	$	1,370,756	$	(308,498)	$	1,062,258
Additions		110,416		(54,884)		55,532
Disposals		(5,233)		158		(5,075)
Vessels impairment loss		(161,199)		89,622		(71,577)
Balance December 31, 2020	$	1,314,740	$	(273,602)	$	1,041,138