Fair Value Measurements and Derivative Instruments (Reconciliation of Items Measured at Fair Value on a Recurring Basis) (Details) - Level 3 [Member] - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Fair value, beginning of period	$ (1,040)	$ (692)	$ (1,058)	$ (711)
Net gains (losses) recognized in earnings	8	18	26	37
Fair value, end of period	(1,032)	(674)	(1,032)	(674)
Total unrealized gains (losses) during the period included in earnings related to instruments held at end of period	8	18	26	37
Series E Preferred Embedded Redemption Option [Member]
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Fair value, beginning of period		356	22	289
Net gains (losses) recognized in earnings		42	(22)	109
Fair value, end of period		398		398
Total unrealized gains (losses) during the period included in earnings related to instruments held at end of period		42	(22)	109
Convertible Debt [Member]
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Fair value, beginning of period			(1,080)	(1,000)
Net gains (losses) recognized in earnings			48	(72)
Fair value, end of period	(1,032)	(1,072)	(1,032)	(1,072)
Total unrealized gains (losses) during the period included in earnings related to instruments held at end of period			48	(72)
Convertible Debt [Member]
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Fair value, beginning of period	(1,040)	(1,048)
Net gains (losses) recognized in earnings	8	(24)
Fair value, end of period	(1,032)	(1,072)	$ (1,032)	$ (1,072)
Total unrealized gains (losses) during the period included in earnings related to instruments held at end of period	$ 8	$ (24)