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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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- Definition Amount of long-term debt payable, sinking fund requirements, and other securities issued that are redeemable by holder at fixed or determinable prices and dates maturing in the fifth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6802200&loc=d3e1835-112601 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 3 -Subparagraph (SX 210.12-04.(a)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e24072-122690 + Details
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