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Convertible Subordinated Notes (5 Year Maturity For Convertible Subordinated Notes) (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Debt Instrument [Line Items]
Principal Maturity, 2019	$ 2,015
Principal Maturity, 2020	1,298
Principal Maturity, 2021	1,046
Principal Maturity, 2022	553
Carrying value of the liability component	36,040
Discount Amortization, 2018	(242)
Discount Amortization, 2019	(270)
Discount Amortization, 2021	(48)
Discount Amortization, 2022	0
Discount Amortization, Total	(560)
2023	27,689
Subordinated Notes, Discount Accretion, Year Five	0
Convertible subordinated notes
Debt Instrument [Line Items]
Principal Maturity, 2019	0
Principal Maturity, 2020	0
Principal Maturity, 2021	6,346
Principal Maturity, 2022	0
Carrying value of the liability component	6,346	$ 143,750
Discount Amortization, Total	(560)	$ (17,559)
Present Value, 2018	(242)
Present Value, 2019	(270)
Present Value, 2021	6,298
Present Value, 2022	0
2023	0
Convertible Subordinated Notes Aggregate Maturity, Year Five	0
Carrying value of the liability component	$ 5,786

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