Revenues, detail (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Revenues [Abstract]
Time charter revenue (operating leases)	$ 202,400	$ 191,977	$ 146,533
Voyage charter revenue	0	1,113	1,095
Other income	4,282	8,458	6,412
Total	$ 206,682	$ 201,548	$ 154,040

Revenues generated from charterers for the time or voyage charter hire of vessels.Revenues from time charter may also include ballast bonus, which is an amount paid by the charterer for repositioning the vessel at the charterers disposal, and other miscellaneous revenues from vessel operations.

No definition available.

Name:	sb_TimeCharterAndVoyageRevenue
Namespace Prefix:	sb_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration