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Convertible Subordinated Notes (Details) - USD ($) shares in Thousands | 3 Months Ended |  |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Mar. 31, 2019 | Mar. 31, 2018 | Dec. 31, 2018 | Dec. 24, 2018 | May 08, 2018 | May 07, 2018 | Mar. 19, 2014
Debt Instrument [Line Items] |  |  |  |  |  |  |
Effect of dilutive securities, Convertible junior subordinated debentures (in shares) | 0 | 1,230 |  |  |  |  |
Carrying Values of Liability and Equity Components, Convertible Subordinated Notes |  |  |  |  |  |  |
Debt issuance costs | $ (901,000) |  | $ (955,000) |  |  |  |
Carrying value of the liability component | 319,261,000 |  | 319,108,000 |  |  |  |
Amortization of Debt Issuance Costs | $ 94,000 | $ 208,000 |  |  |  |  |
Convertible Subordinated Notes [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Stated interest rate percentage | 2.75% |  |  |  |  |  | 2.75%
Carrying Values of Liability and Equity Components, Convertible Subordinated Notes |  |  |  |  |  |  |
Convertible subordinated notes, principal amount |  |  | 6,346,000 | $ 22,418,000.16 | $ 28,800,000 | $ 115,000,000 | $ 143,750,000
Unamortized discount of liability component | $ (502,000) |  | (560,000) |  |  |  |
Debt issuance costs | (48,000) |  | (54,000) |  |  |  |
Carrying value of the liability component | 5,796,000 |  | 5,732,000 | $ 6,346,000 |  |  |
Carrying value of the equity component | 789,000 |  | $ 789,000 |  |  |  |
Convertible subordinated notes, fair value | 6,800,000 |  |  |  |  |  |
Contractual coupon interest expense | 0 | 988,000 |  |  |  |  |
Accretion of discount, convertible subordinated notes | $ 57,000 | $ 1,160,000 |  |  |  |  |
Effective interest rate percentage | 3.15% | 11.3199% |  |  |  |  |
Amortization of Debt Issuance Costs | $ 6,000 | $ 132,000 |  |  |  |  |

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