Face (par) amount of debt instrument at time of issuance.

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- Definition

Contractual interest rate for funds borrowed, under the debt agreement.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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No definition available.

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- Definition

Date when the debt instrument is scheduled to be fully repaid, in CCYY-MM-DD format.

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- Definition

Amount of debt issuance costs (for example, but not limited to, legal, accounting, broker, and regulatory fees).

+ References

No definition available.

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- Definition

Including the current and noncurrent portions, carrying value as of the balance sheet date of long-term debt (with maturities initially due after one year or beyond the operating cycle if longer) identified as Junior Subordinated Notes, which have a lower priority than senior instruments.

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- Definition

Carrying amount of long-term debt, net of unamortized discount or premium, including current and noncurrent amounts. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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- Definition

Including the current and noncurrent portions, carrying value as of the balance sheet date of all notes and loans payable (with maturities initially due after one year or beyond the operating cycle if longer).

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Including the current and noncurrent portions, aggregate carrying amount of all types of notes payable, as of the balance sheet date, with initial maturities beyond one year or beyond the normal operating cycle, if longer.

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Including the current and noncurrent portions, carrying value as of the balance sheet date of Notes with the highest claim on the assets of the issuer in case of bankruptcy or liquidation (with maturities initially due after one year or beyond the operating cycle if longer). Senior note holders are paid off in full before any payments are made to junior note holders.

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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