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Convertible Subordinated Notes (5 Year Maturity For Convertible Subordinated Notes) (Details) - USD ($)	Dec. 31, 2016	Feb. 09, 2016	Dec. 31, 2015
Debt Instrument [Line Items]
Principal Maturity, 2017	$ 13,021,000
Principal Maturity, 2018	16,854,000
Principal Maturity, 2019	16,918,000
Principal Maturity, 2020	19,042,000
Principal Maturity, 2021	148,379,000
Carrying value of the liability component	218,695,000
Discount Amortization, 2017	(4,328,000)
Discount Amortization, 2018	(4,844,000)
Discount Amortization, 2019	(5,422,000)
Discount Amortization, 2020	(6,068,000)
Discount Amortization, 2021	(1,225,000)
Discount Amortization, Total	(21,887,000)
Convertible subordinated notes
Debt Instrument [Line Items]
Principal Maturity, 2017	0
Principal Maturity, 2018	0
Principal Maturity, 2019	0
Principal Maturity, 2020	0
Principal Maturity, 2021	143,750,000
Carrying value of the liability component	143,750,000	$ 143,750,000	$ 143,750,000
Discount Amortization, Total	(21,887,000)		$ (25,754,000)
Present Value, 2017	(4,328,000)
Present Value, 2018	(4,844,000)
Present Value, 2019	(5,422,000)
Present Value, 2020	(6,068,000)
Present Value, 2021	142,525,000
Carrying value of the liability component	$ 121,863,000

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