Beneficial Interest in Debt and Interest Expense (Debt Covenants and Guarantees) (Details) - USD ($) $ in Thousands	6 Months Ended
	Dec. 31, 2020	Jun. 30, 2020	Dec. 31, 2019
Guarantor Obligations [Line Items]
Other Restrictions on Payment of Dividends		95.00%
Notes Payable, Net		$ 3,900,937	$ 3,710,327
International Market Place [Member]
Guarantor Obligations [Line Items]
Notes Payable, Net		250,000
Interest Payable		$ 500
Unconditional Guaranty Liability, Principal Balance, Percent		100.00%
Unconditional Guaranty Liability, Interest, Percent		100.00%
Debt Instrument, Term		3 years
International Plaza [Member]
Guarantor Obligations [Line Items]
Debt Instrument, Face Amount		$ 175,000
Company's Percentage Share of Derivative Guarantee		50.10%
Interest Rate Derivative Liabilities, at Fair Value		$ 3,700
Interest Payable		200
Unsecured Debt $275M Term Loan [Member]
Guarantor Obligations [Line Items]
Unsecured Debt		275,000
Debt Instrument, Description of Variable Rate Basis	LIBOR
Debt Instrument, Basis Spread on Variable Rate	1.80%
Unsecured Debt 250M Term Loan [Member]
Guarantor Obligations [Line Items]
Unsecured Debt		$ 250,000
Debt Instrument, Description of Variable Rate Basis	LIBOR
Debt Instrument, Basis Spread on Variable Rate	1.90%
Line of Credit [Member]
Guarantor Obligations [Line Items]
Debt Instrument, Description of Variable Rate Basis	LIBOR
Debt Instrument, Interest Rate, Basis for Effective Rate	0.5%
Debt Instrument, Basis Spread on Variable Rate	1.60%
Line of Credit Facility, Commitment Fee Percentage	0.25%
Series J Preferred Stock [Member]
Guarantor Obligations [Line Items]
Preferred Stock, Dividend Rate, Percentage		6.50%
Series K Preferred Stock [Member]
Guarantor Obligations [Line Items]
Preferred Stock, Dividend Rate, Percentage		6.25%