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Long-Term Debt (Tables) | 12 Months Ended
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Dec. 31, 2018
Long-Term Debt [Abstract] |
Aggregate annual maturities of long-term debt | Other Borrowings Information Aggregate annual maturities of long-term debt, based on the terms stated in the respective agreements, are as follows:
2019 |  | $ | - |
2020 |  |  | - |
2021 |  |  | - |
2022 |  |  | - |
2023 |  |  | - |
Thereafter |  |  | 636,556 |
Debt Instrument [Line Items] |
Schedule of long-term debt instruments | Long-term debt consists of the following:
|  | December 31, 2018 |  |  | December 31, 2017 |
Credit facility |  | $ | - |  |  | $ | 150,000 |
Convertible senior notes, due 2025 |  |  | 495,203 |  |  |  | - |
Convertible senior debentures, due 2040 |  |  | 539 |  |  |  | 110,412 |
Convertible senior debentures, due 2041 |  |  | 12,812 |  |  |  | 56,641 |
Convertible senior debentures, due 2042 |  |  | 923 |  |  |  | 62,518 |
Deferred financing costs |  |  | (14,968 | ) |  |  | (9,101 | )
|  |  | 494,509 |  |  |  | 370,470 |
Less current portion |  |  | - |  |  |  | - |
|  | $ | 494,509 |  |  | $ | 370,470 |
Key terms of the convertible debentures | The following table summarizes some key facts and terms regarding the three series of outstanding convertible senior debentures following the adjustment made to the conversion rate of the debentures on the ex-dividend date of the December 20, 2018 dividend payment:
|  | Due 2040 |  |  | Due 2041 |  |  | Due 2042 |
Issuance date |  | November 9, 2010 |  |  | May 13, 2011 |  |  | May 31, 2012 |
Maturity date |  | November 15, 2040 |  |  | May 15, 2041 |  |  | June 1, 2042 |
Principal amount |  | $ | 1,310 |  |  | $ | 33,078 |  |  | $ | 2,168 |
Cash coupon rate (per annum) |  |  | 2.25 | % |  |  | 2.25 | % |  |  | 2.25 | %
Nonconvertible debt borrowing rate at issuance (per annum) |  |  | 8.00 | % |  |  | 8.375 | % |  |  | 7.50 | %
Conversion rate effective December 5, 2018 (per $1 principal amount) |  |  | 78.3806 |  |  |  | 57.1981 |  |  |  | 92.1569 |
Effective conversion price effective December 5, 2018 (per share) |  | $ | 12.76 |  |  | $ | 17.48 |  |  | $ | 10.85 |
130% of the conversion price (per share) |  | $ | 16.59 |  |  | $ | 22.72 |  |  | $ | 14.11 |
Call date |  | November 20, 2020 |  |  | May 20, 2021 |  |  | June 7, 2022 |
Convertible Senior Notes, Due 2025 [Member] |
Debt Instrument [Line Items] |
Liability and equity components of the convertible debentures | The carrying values of the liability and equity components of the convertible notes are reflected in the Company's consolidated balance sheets as follows:
|  | Principal amount of the notes |  |  | Unamortized discount |  |  | Carrying value of liability component |  |  | Equity component (including temporary equity) - net carrying value |
December 31, 2018 |  | $ | 600,000 |  |  |  | (104,797 | ) |  | $ | 495,203 |  |  | $ | 85,262 |
Schedule of Interest Expense on Convertible Debt [Table Text Block] | Interest expense for the year ended December 31, 2018 related to the convertible notes due 2025 is reflected on the consolidated statement of operations as follows:
Contractual coupon interest |  |  | Non-cash amortization of debt discount |  |  | Non-cash amortization of deferred financing costs |  |  | Total interest expense related to the notes |
$ | 7,463 |  |  |  | 7,240 |  |  |  | 1,059 |  |  | $ | 15,762 |
Convertible senior debentures [Member] |
Debt Instrument [Line Items] |
Liability and equity components of the convertible debentures | The carrying values of the liability and equity components of the convertible debentures are reflected in the Company's accompanying consolidated balance sheets as follows:
|  | Principal amount of the debentures |  |  | Unamortized discount |  |  | Embedded derivative |  |  | Carrying value of liability component |  |  | Equity component (including temporary equity) - net carrying value |
December 31, 2018 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Due 2040 |  | $ | 1,310 |  |  |  | (772 | ) |  |  | 1 |  |  | $ | 539 |  |  | $ | 528 |
Due 2041 |  | $ | 33,078 |  |  |  | (20,333 | ) |  |  | 67 |  |  | $ | 12,812 |  |  | $ | 13,725 |
Due 2042 |  | $ | 2,168 |  |  |  | (1,247 | ) |  |  | 2 |  |  | $ | 923 |  |  | $ | 839 |
Total |  | $ | 36,556 |  |  | $ | (22,352 | ) |  | $ | 70 |  |  | $ | 14,274 |  |  | $ | 15,092 |
December 31, 2017 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Due 2040 |  | $ | 275,000 |  |  |  | (164,794 | ) |  |  | 206 |  |  | $ | 110,412 |  |  | $ | 110,094 |
Due 2041 |  | $ | 150,000 |  |  |  | (93,573 | ) |  |  | 214 |  |  | $ | 56,641 |  |  | $ | 62,246 |
Due 2042 |  | $ | 150,000 |  |  |  | (87,600 | ) |  |  | 118 |  |  | $ | 62,518 |  |  | $ | 57,874 |
Total |  | $ | 575,000 |  |  | $ | (345,967 | ) |  | $ | 538 |  |  | $ | 229,571 |  |  | $ | 230,214 |
Schedule of Interest Expense on Convertible Debt [Table Text Block] | Interest expense related to the debentures is reflected on the accompanying consolidated statements of operations for the years ended December 31:
|  | Contractual coupon interest |  |  | Non-cash amortization of debt discount |  |  | Non-cash amortization of deferred financing costs |  |  | Non-cash change in value of derivative liability |  |  | Total interest expense related to the debentures |
2018 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Due 2040 |  | $ | 3,150 |  |  |  | 1,340 |  |  |  | 45 |  |  |  | 81 |  |  | $ | 4,616 |
Due 2041 |  | $ | 3,156 |  |  |  | 1,285 |  |  |  | 45 |  |  |  | 43 |  |  | $ | 4,529 |
Due 2042 |  | $ | 2,321 |  |  |  | 904 |  |  |  | 36 |  |  |  | 4 |  |  | $ | 3,265 |
Total |  | $ | 8,627 |  |  | $ | 3,529 |  |  | $ | 126 |  |  | $ | 128 |  |  | $ | 12,410 |
2017 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Due 2040 |  | $ | 6,188 |  |  |  | 2,479 |  |  |  | 88 |  |  |  | (187 | ) |  | $ | 8,568 |
Due 2041 |  | $ | 3,375 |  |  |  | 1,270 |  |  |  | 47 |  |  |  | (71 | ) |  | $ | 4,621 |
Due 2042 |  | $ | 3,375 |  |  |  | 1,235 |  |  |  | 54 |  |  |  | (58 | ) |  | $ | 4,606 |
Total |  | $ | 12,938 |  |  | $ | 4,984 |  |  | $ | 189 |  |  | $ | (316 | ) |  | $ | 17,795 |
2016 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Due 2040 |  | $ | 6,188 |  |  |  | 2,292 |  |  |  | 88 |  |  |  | (183 | ) |  | $ | 8,385 |
Due 2041 |  | $ | 3,375 |  |  |  | 1,171 |  |  |  | 47 |  |  |  | (153 | ) |  | $ | 4,440 |
Due 2042 |  | $ | 3,375 |  |  |  | 1,147 |  |  |  | 54 |  |  |  | (126 | ) |  | $ | 4,450 |
Total |  | $ | 12,938 |  |  | $ | 4,610 |  |  | $ | 189 |  |  | $ | (462 | ) |  | $ | 17,275 |

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- Definition Tabular disclosure of borrowings which can be exchanged for a specified number of another security at the option of the issuer or the holder. Disclosures include, but are not limited to, principal amount, amortized premium or discount, and amount of liability and equity components. + References No definition available. + Details
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