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Convertible Subordinated Notes (5 Year Maturity For Convertible Subordinated Notes) (Details) - USD ($) | Dec. 31, 2015 | Dec. 31, 2014 | Mar. 19, 2014
--- | --- | --- | ---
Debt Instrument [Line Items] |  |  |
Principal Maturity, 2016 | $ 12,012,000 |  |
Principal Maturity, 2017 | 13,499,000 |  |
Principal Maturity, 2018 | 15,184,000 |  |
Principal Maturity, 2019 | 167,168,000 |  |
Principal Maturity, 2020 | 383,000 |  |
Principal Maturity, 2020 and thereafter | 220,000 |  |
Carrying value of the liability component | 208,466,000 |  |
Discount Amortization, 2016 | (3,867,000) |  |
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 and thereafter | (1,225,000) |  |
Discount Amortization, Total | (25,754,000) |  |
Convertible subordinated notes |  |  |
Debt Instrument [Line Items] |  |  |
Principal Maturity, 2016 | 0 |  |
Principal Maturity, 2017 | 0 |  |
Principal Maturity, 2018 | 0 |  |
Principal Maturity, 2019 | 0 |  |
Principal Maturity, 2020 | 0 |  |
Principal Maturity, 2020 and thereafter | 143,750,000 |  |
Carrying value of the liability component | 143,750,000 | $ 143,750,000 | $ 143,750,000
Discount Amortization, Total | (25,754,000) | (29,208,000) |
Present Value, 2016 | (3,867,000) |  |
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 and thereafter | 142,525,000 |  |
Carrying value of the liability component | $ 117,996,000 | $ 114,542,000 |

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