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		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Fair value, beginning of period	$ (674)	$ (784)	$ (711)	$ (755)
Net gains (losses) recognized in earnings	(97)	(15)	(60)	(44)
Fair value, end of period	(771)	(799)	(771)	(799)
Total unrealized gains (losses) during the period included in earnings related to instruments held at end of period	(97)	(15)	(60)	(44)
Series E Preferred Embedded Redemption Option [Member]
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Fair value, beginning of period	398	266	289	314
Net gains (losses) recognized in earnings	30	(16)	139	(64)
Fair value, end of period	428	250	428	250
Total unrealized gains (losses) during the period included in earnings related to instruments held at end of period	30	(16)	139	(64)
Convertible Debt [Member]
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Fair value, beginning of period	(1,072)	(1,050)	(1,000)	(1,069)
Net gains (losses) recognized in earnings	(127)	1	(199)	20
Fair value, end of period	(1,199)	(1,049)	(1,199)	(1,049)
Total unrealized gains (losses) during the period included in earnings related to instruments held at end of period	$ (127)	$ 1	$ (199)	$ 20