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Convertible Subordinated Notes (5 Year Maturity For Convertible Subordinated Notes) (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016	Feb. 09, 2016
Debt Instrument [Line Items]
Principal Maturity, 2018	$ 16,927
Principal Maturity, 2019	16,949
Principal Maturity, 2020	19,068
Principal Maturity, 2021	172,699
Principal Maturity, 2022	530
Carrying value of the liability component	230,048
Discount Amortization, 2018	(4,844)
Discount Amortization, 2019	(5,422)
Discount Amortization, 2020	(6,068)
Discount Amortization, 2021	(1,225)
Discount Amortization, 2022	0
Discount Amortization, Total	(17,559)
Convertible subordinated notes
Debt Instrument [Line Items]
Principal Maturity, 2018	0
Principal Maturity, 2019	0
Principal Maturity, 2020	0
Principal Maturity, 2021	143,750
Principal Maturity, 2022	0
Carrying value of the liability component	143,750	$ 143,750	$ 143,750
Discount Amortization, Total	(17,559)	$ (21,887)
Present Value, 2018	(4,844)
Present Value, 2019	(5,422)
Present Value, 2020	(6,068)
Present Value, 2021	142,525
Present Value, 2022	0
Carrying value of the liability component	$ 126,191

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