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(Common Units) (Narrative) (Details) $ / shares in Units, $ in Millions |  | 6 Months Ended
--- | --- | ---
Feb. 06, 2020 USD ($) shares | Jun. 30, 2020 USD ($) yr $ / shares shares
MYLTIP 2017 [Member] |  |
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items] |  |
Final awards percentage of target | 83.80% |
Value of MYLTIP Awards | $ | $ 17.6 |
MYLTIP Units forfeited | 270,942 |
OP Units [Member] |  |
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items] |  |
OP Units for redemption (in shares) |  | 764,640
Redemption of OP units issued on conversion of LTIP, OPP and MYLTIP units (in shares) |  | 82,551
MYLTIP Units distribution as percentage of OP Unit distribution prior to measurement date |  | 10.00%
Restriction on redemption of OP Unit to Common Stock (in years) | yr |  | 1
Redemption of OP Unit equivalent to Common Stock (in shares) |  | 1
Common units of operating partnership if converted value | $ |  | $ 1,600.0
Closing price of common stock (in dollars per share) | $ / shares |  | $ 90.38

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