INVESTMENT IN UNCONSOLIDATED JOINT VENTURES (Investment In Unconsolidated Joint Ventures) (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Investments in Unconsolidated Joint Ventures
Investment in unconsolidated joint ventures	$ 5,580	$ 6,633
Cindat Hersha Owner JV, LLC | Hilton and IHG branded hotels in NYC
Investments in Unconsolidated Joint Ventures
Percent Owned	31.00%
Investment in unconsolidated joint ventures	$ 0	0
Hiren Boston, LLC | Courtyard by Marriott, South Boston, MA
Investments in Unconsolidated Joint Ventures
Percent Owned	50.00%
Investment in unconsolidated joint ventures	$ 189	219
SB Partners, LLC | Holiday Inn Express, South Boston, MA
Investments in Unconsolidated Joint Ventures
Percent Owned	50.00%
Investment in unconsolidated joint ventures	$ 0	0
SB Partners Three, LLC | Home2 Suites, South Boston, MA
Investments in Unconsolidated Joint Ventures
Percent Owned	50.00%
Investment in unconsolidated joint ventures	$ 5,391	$ 6,414