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Debt (Schedule of Long-term Debt Instruments) (Details) - USD ($) | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2016 | Dec. 31, 2015 | Jun. 30, 2006
Debt Instrument [Line Items] |  |  |
Long-term Debt, Gross | $ 3,110,853,000 | $ 2,312,629,000 |
Debt Instrument, Unamortized Discount (Premium) and Debt Issuance Costs, Net | 22,218,000 | 15,081,000 |
Debt Instrument, Face Amount |  |  | $ 850,000,000.0
Long-term debt | 3,088,635,000 | 2,297,548,000 |
Senior Notes Due 2017 [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Long-term Debt, Gross | 299,945,000 | 299,671,000 |
Debt Instrument, Face Amount | $ 300,000,000.0 |  |
Debt Instrument, Maturity Date | Dec. 31, 2017 |  |
Debt Instrument, Interest Rate, Stated Percentage | 5.625% |  |
Senior Notes Due 2019 [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Long-term Debt, Gross | $ 399,805,000 | 399,737,000 |
Debt Instrument, Face Amount | $ 400,000,000 |  |
Debt Instrument, Maturity Date | Dec. 31, 2019 |  |
Debt Instrument, Interest Rate, Stated Percentage | 6.45% |  |
Senior Notes Due 2021 [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Long-term Debt, Gross | $ 399,025,000 | 398,803,000 |
Debt Instrument, Face Amount | $ 400,000,000 |  |
Debt Instrument, Maturity Date | Dec. 31, 2021 |  |
Debt Instrument, Interest Rate, Stated Percentage | 5.00% |  |
Senior Notes Due 2023 [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Long-term Debt, Gross | $ 398,986,000 | 398,835,000 |
Debt Instrument, Face Amount | $ 400,000,000 |  |
Debt Instrument, Maturity Date | Dec. 31, 2023 |  |
Debt Instrument, Interest Rate, Stated Percentage | 4.70% |  |
Senior Notes Due 2026 [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Long-term Debt, Gross | $ 399,985,000 | 0 |
Debt Instrument, Unamortized Discount (Premium) and Debt Issuance Costs, Net | 8,800,000 |  |
Debt Instrument, Face Amount | $ 400,000,000 |  |
Debt Instrument, Maturity Date | Dec. 31, 2026 |  |
Debt Instrument, Interest Rate, Stated Percentage | 3.95% |  |
Subordinated Debentures Due 2042 [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Long-term Debt, Gross | $ 400,000,000 | 400,000,000 |
Debt Instrument, Face Amount | $ 400,000,000 |  |
Debt Instrument, Maturity Date | Dec. 31, 2042 |  |
Debt Instrument, Interest Rate, Stated Percentage | 6.20% |  |
Subordinated Debentures Due 2056 [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Long-term Debt, Gross | $ 400,000,000 | 0 |
Debt Instrument, Face Amount | $ 400,000,000.0 |  |
Debt Instrument, Maturity Date | Dec. 31, 2056 |  |
Debt Instrument, Interest Rate, Stated Percentage | 5.75% |  |
Junior Subordinated Debentures Due 2065 [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Long-term Debt, Gross | $ 318,737,000 | 318,734,000 |
Debt Instrument, Face Amount | $ 400,000,000 |  |
Debt Instrument, Maturity Date | Dec. 31, 2065 |  |
Notes Payable to Banks [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Long-term Debt, Gross | $ 94,370,000 | $ 96,849,000 |
Debt Instrument, Face Amount | $ 100,000,000 |  |
Debt Instrument, Maturity Date | Dec. 31, 2039 |  |
Debt Instrument, Interest Rate, Stated Percentage | 4.09% |  |

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- Definition Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt. + 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 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(16)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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- Definition Contractual interest rate for funds borrowed, under the debt agreement. + 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(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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