Fair Value Measurements and Derivative Instruments (Schedule of Fair Value Assets and (Liabilities) Carried at Fair Value and Measured on Recurring Basis) (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Series E Preferred embedded redemption option		$ 22
Convertible debt	$ (16,875)	(1,080)
Total	(17,755)	(1,424)
Level 2 [Member]
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Total	(880)	(366)
Level 3 [Member]
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Convertible debt	(16,875)	(1,080)
Total	(16,875)	(1,058)
Interest Rate Derivatives [Member]
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Series E Preferred embedded redemption option	(880)	(366)
Interest Rate Derivatives [Member] | Level 2 [Member]
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Series E Preferred embedded redemption option	$ (880)	(366)
Series E Preferred Embedded Redemption Option [Member]
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Series E Preferred embedded redemption option		22
Series E Preferred Embedded Redemption Option [Member] | Level 3 [Member]
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Series E Preferred embedded redemption option		$ 22