Revenues - Revenues (Details) - USD ($) $ in Thousands	9 Months Ended
Sep. 30, 2021	Sep. 30, 2020
Revenues [Abstract]
Time charter revenue	$ 235,129	$ 146,499
Voyage charter revenue	5,156	1,692
Other income	6,747	3,441
Total	$ 247,032	$ 151,632

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