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Debt (Schedule of Long-term Debt Instruments) (Details) - USD ($) |  |  | 12 Months Ended |
--- | --- | --- | --- | ---
Aug. 21, 2014 | Sep. 19, 2013 | Dec. 31, 2015 | Dec. 31, 2014 | Jun. 30, 2006
Debt Instrument [Line Items] |  |  |  |  |
Debt Instrument, Face Amount |  |  |  |  | $ 850,000,000.0
Junior Subordinated Notes |  |  | $ 318,734,000 | $ 318,732,000 |
Notes and Loans Payable |  |  | 2,312,629,000 | 2,314,293,000 |
Debt Issuance Cost |  |  |  | (25,300,000) |
Long-term debt |  |  | 2,297,548,000 | 2,297,704,000 |
Long-term Debt [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt Issuance Cost |  |  | (15,081,000) | (16,589,000) |
Subordinated Debentures Due 2042 [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt Instrument, Face Amount |  |  | $ 400,000,000 |  |
Debt Instrument, Maturity Date |  |  | Dec. 31, 2042 |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  | 6.20% |  |
Notes Payable |  |  | $ 400,000,000 | 400,000,000 |
Junior Subordinated Debentures Due 2065 [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt Instrument, Face Amount |  |  | $ 400,000,000 |  |
Debt Instrument, Maturity Date |  |  | Dec. 31, 2065 |  |
Senior Notes Due 2023 [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt Instrument, Face Amount |  | $ 400,000,000.0 | $ 400,000,000 |  |
Debt Instrument, Maturity Date |  | Sep. 15, 2023 | Dec. 31, 2023 |  |
Debt Instrument, Interest Rate, Stated Percentage |  | 4.70% | 4.70% |  |
Senior Notes |  |  | $ 398,835,000 | 398,684,000 |
Senior Notes Due 2021 [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt Instrument, Face Amount |  |  | $ 400,000,000 |  |
Debt Instrument, Maturity Date |  |  | Dec. 31, 2021 |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  | 5.00% |  |
Senior Notes |  |  | $ 398,803,000 | 398,583,000 |
Senior Notes Due 2019 [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt Instrument, Face Amount |  |  | $ 400,000,000 |  |
Debt Instrument, Maturity Date |  |  | Dec. 31, 2019 |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  | 6.45% |  |
Senior Notes |  |  | $ 399,737,000 | 399,669,000 |
Senior Notes Due 2017 [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt Instrument, Face Amount |  |  | $ 300,000,000 |  |
Debt Instrument, Maturity Date |  |  | Dec. 31, 2017 |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  | 5.625% |  |
Senior Notes |  |  | $ 299,671,000 | 299,397,000 |
Notes Payable to Banks [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt Instrument, Face Amount | $ 100,000,000.0 |  | $ 100,000,000 |  |
Debt Instrument, Maturity Date | Sep. 01, 2039 |  | Dec. 31, 2039 |  |
Debt Instrument, Interest Rate, Stated Percentage | 4.09% |  | 4.09% |  |
Notes Payable |  |  | $ 96,849,000 | $ 99,228,000 |

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