INVESTMENT IN UNCONSOLIDATED JOINT VENTURES (Investment In Unconsolidated Joint Ventures) (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Investments in Unconsolidated Joint Ventures
Investment in Unconsolidated Joint Ventures	$ 7,082	$ 8,446
Hilton and IHG branded hotels in NYC | Cindat Hersha Owner JV, LLC
Investments in Unconsolidated Joint Ventures
Percent owned (percentage)	31.00%
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	$ 322	1,434
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	$ 6,760	$ 7,012