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Debt (Tables) | 12 Months Ended
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Dec. 31, 2016
Debt Disclosure [Abstract] |
Schedule of Long-term Debt Instruments [Table Text Block] | The Company’s long-term debt consists of the following as of December 31, 2016 and 2015 (dollars in thousands):
|  | 2016 |  | 2015
$300 million 5.625% Senior Notes due 2017 |  | $ | 299,945 |  |  | $ | 299,671 |
$400 million 6.45% Senior Notes due 2019 |  | 399,805 |  |  | 399,737 |
$400 million 5.00% Senior Notes due 2021 |  | 399,025 |  |  | 398,803 |
$400 million 4.70% Senior Notes due 2023 |  | 398,986 |  |  | 398,835 |
$400 million 3.95% Senior Notes due 2026 |  | 399,985 |  |  | — |
$100 million 4.09% Promissory Note due 2039 |  | 94,370 |  |  | 96,849 |
$400 million 6.20% Subordinated Debentures due 2042 |  | 400,000 |  |  | 400,000 |
$400 million 5.75% Subordinated Debentures due 2056 |  | 400,000 |  |  | — |
$400 million Variable Rate Junior Subordinated Debentures due 2065 |  | 318,737 |  |  | 318,734 |
Sub-total |  | 3,110,853 |  |  | 2,312,629 |
Unamortized issuance costs |  | (22,218 | ) |  | (15,081 | )
Long-term Debt |  | $ | 3,088,635 |  |  | $ | 2,297,548 |
Schedule of Maturities of Long-term Debt [Table Text Block] | Future principal payments due on long-term debt, excluding discounts, as of December 31, 2016, were as follows (dollars in thousands):
| Calendar Year
| 2017 |  | 2018 |  | 2019 |  | 2020 |  | 2021 |  | Thereafter
Long-term debt | $ | 302,582 |  |  | $ | 2,690 |  |  | $ | 402,802 |  |  | $ | 2,919 |  |  | $ | 403,040 |  |  | $ | 2,000,140 |
Schedule of Line of Credit Facilities [Table Text Block] | The following table provides additional information on the Company’s existing committed credit facilities as of December 31, 2016 and 2015 (dollars in thousands):
|  |  |  | Amount Utilized(1) December 31, |  |
Facility Capacity |  | Maturity Date |  | 2016 |  | 2015 |  | Basis of Fees
270,000 |  |  | November 2017 |  | 270,000 |  |  | 270,000 |  |  | Fixed
161,974 (2) |  |  | November 2017 |  | 31,382 |  |  | 66,154 |  |  | Fixed
72,080 (2) |  |  | December 2018 |  | 72,080 |  |  | 36,430 |  |  | Fixed
17,513 (2) |  |  | March 2019 |  | 17,513 |  |  | 45,422 |  |  | Fixed
120,000 |  |  | June 2019 |  | 85,040 |  |  | 85,040 |  |  | Fixed
850,000 |  |  | September 2019 |  | 96,095 |  |  | 313,659 |  |  | Senior unsecured long-term debt rating
100,000 |  |  | June 2020 |  | 70,690 |  |  | 68,657 |  |  | Fixed
(1) | Represents issued but undrawn letters of credit. There was no cash borrowed for the periods presented.
(2) | Foreign currency denominated facility, amounts presented are in U.S. dollars.

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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=6928386&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=6479336&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=6928386&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=6928386&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=6928386&loc=d3e21521-112644 + Details
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- Definition Tabular disclosure of short-term or long-term contractual arrangements with lenders, including letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. + 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 210.5-02.19(b),22(b)) -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 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 + 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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