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Long-Term Debt (Tables) | 12 Months Ended
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Dec. 31, 2017
Long-Term Debt [Abstract] |
Schedule of long-term debt instruments | Long-term debt consists of the following:
|  | December 31, 2017 |  |  | December 31, 2016 |
Credit facility |  | $ | 150,000 |  |  | $ | 143,000 |
Convertible senior debentures, due 2040 |  |  | 110,412 |  |  |  | 108,120 |
Convertible senior debentures, due 2041 |  |  | 56,641 |  |  |  | 55,442 |
Convertible senior debentures, due 2042 |  |  | 62,518 |  |  |  | 61,341 |
Deferred financing costs |  |  | (9,101 | ) |  |  | (10,880 | )
|  |  | 370,470 |  |  |  | 357,023 |
Less current portion |  |  | - |  |  |  | - |
|  | $ | 370,470 |  |  | $ | 357,023 |
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 21, 2017 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 |  | $ | 275,000 |  |  | $ | 150,000 |  |  | $ | 150,000 |
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 6, 2017 (per $1 principal amount) |  |  | 77.2085 |  |  |  | 56.3427 |  |  |  | 90.7787 |
Effective conversion price effective December 6, 2017 (per share) |  | $ | 12.95 |  |  | $ | 17.75 |  |  | $ | 11.02 |
130% of the conversion price (per share) |  | $ | 16.84 |  |  | $ | 23.08 |  |  | $ | 14.33 |
Call date |  | November 20, 2020 |  |  | May 20, 2021 |  |  | June 7, 2022 |
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, 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 |
December 31, 2016 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Due 2040 |  | $ | 275,000 |  |  |  | (167,273 | ) |  |  | 393 |  |  | $ | 108,120 |  |  | $ | 110,094 |
Due 2041 |  | $ | 150,000 |  |  |  | (94,843 | ) |  |  | 285 |  |  | $ | 55,442 |  |  | $ | 62,246 |
Due 2042 |  | $ | 150,000 |  |  |  | (88,835 | ) |  |  | 176 |  |  | $ | 61,341 |  |  | $ | 57,874 |
Total |  | $ | 575,000 |  |  | $ | (350,951 | ) |  | $ | 854 |  |  | $ | 224,903 |  |  | $ | 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 |
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 |
2015 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Due 2040 |  | $ | 6,188 |  |  |  | 2,120 |  |  |  | 88 |  |  |  | 50 |  |  | $ | 8,446 |
Due 2041 |  | $ | 3,375 |  |  |  | 1,078 |  |  |  | 47 |  |  |  | 97 |  |  | $ | 4,597 |
Due 2042 |  | $ | 3,375 |  |  |  | 1,066 |  |  |  | 54 |  |  |  | 64 |  |  | $ | 4,559 |
Total |  | $ | 12,938 |  |  | $ | 4,264 |  |  | $ | 189 |  |  | $ | 211 |  |  | $ | 17,602 |
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:
2018 |  | $ | - |
2019 |  |  | - |
2020 |  |  | 150,000 |
2021 |  |  | - |
2022 |  |  | - |
Thereafter |  |  | 575,000 |

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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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- Definition Tabular disclosure of long-debt instruments or arrangements, including identification, terms, features, collateral requirements and other information necessary to a fair presentation. These are debt arrangements that originally required repayment more than twelve months after issuance or greater than the normal operating cycle of the entity, if longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=84159872&loc=d3e21475-112644 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 470 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=75038535&loc=d3e64711-112823 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(e),(f)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=64930739&loc=d3e28878-108400 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=84159872&loc=d3e21538-112644 Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=84159872&loc=d3e21506-112644 Reference 8: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 1A -URI http://asc.fasb.org/extlink&oid=64930785&loc=d3e28541-108399 Reference 9: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=64930785&loc=d3e28551-108399 Reference 10: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=84159872&loc=d3e21521-112644 + Details
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- Definition Tabular disclosure of the combined aggregate amount of maturities and sinking fund requirements for all long-term borrowings for each of the five years following the date of the latest balance sheet date presented. + 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 + Details
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