INVESTMENT IN UNCONSOLIDATED JOINT VENTURES (Investment In Unconsolidated Joint Ventures) (Details) - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
Investments in Unconsolidated Joint Ventures
Investment in Unconsolidated Joint Ventures	$ 5,936	$ 6,633
Hilton and IHG branded hotels in NYC | Cindat Hersha Owner JV, LLC
Investments in Unconsolidated Joint Ventures
Percent owned (percentage)	31.20%
Investment in Unconsolidated Joint Ventures	$ 0	0
Courtyard by Marriott, South Boston, MA | Hiren Boston, LLC
Investments in Unconsolidated Joint Ventures
Percent owned (percentage)	50.00%
Investment in Unconsolidated Joint Ventures	$ 29	219
Holiday Inn Express, South Boston, MA | SB Partners, LLC
Investments in Unconsolidated Joint Ventures
Percent owned (percentage)	50.00%
Investment in Unconsolidated Joint Ventures	$ 0	0
Home2 Suites, South Boston, MA | SB Partners Three, LLC
Investments in Unconsolidated Joint Ventures
Percent owned (percentage)	50.00%
Investment in Unconsolidated Joint Ventures	$ 5,907	$ 6,414