Fair Value Disclosures (Fair Value Assets and Liabilities Measured on Recurring Basis) (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
	Jun. 30, 2020	Jun. 30, 2020	Jun. 30, 2019	Dec. 31, 2019
Fair Value, Assets and Liabilities Measured on Recurring Basis, Financial Statement Captions [Line Items]
Equity Securities FV NI Recognized Gain Loss	$ (1,535)	$ (1,535)	$ 3,346
Fair Value, Inputs, Level 1 [Member]
Assets and liabilities measured at fair value on a recurring basis [Abstract]
Insurance deposit	11,301	11,301		$ 11,213
Total Assets	11,301	11,301		11,213
Fair Value, Inputs, Level 2 [Member]
Assets and liabilities measured at fair value on a recurring basis [Abstract]
Total Assets	0	0		0
Derivative interest rate contracts (Note 7)	(30,043)	(30,043)		(15,419)
Total liabilities	$ (30,043)	$ (30,043)		$ (15,419)