Fair Value Disclosures (Fair Value Assets and Liabilities Measured on Recurring Basis) (Details) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Fair Value, Inputs, Level 1 [Member]
Assets and liabilities measured at fair value on a recurring basis [Abstract]
Insurance deposit	$ 11,239	$ 11,213
Total Assets	11,239	11,213
Fair Value, Inputs, Level 2 [Member]
Assets and liabilities measured at fair value on a recurring basis [Abstract]
Total Assets	0	0
Derivative interest rate contracts (Note 7)	(30,965)	(15,419)
Total liabilities	$ (30,965)	$ (15,419)
SPG Units [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis, Financial Statement Captions [Line Items]
Available-For-Sale Securities Held	0	0