Amount of long-term debt before deduction of unamortized discount or premium. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt, with initial maturities beyond one year or the normal operating cycle, if longer.

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

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Debt (Details 2) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Sep. 30, 2013
Maturity of primary debt
2016	$ 350,000
2017	983,119
2018	934,372
2019	339,607
Thereafter	1,750,000
Long-term debt total	4,357,098us-gaap_DebtInstrumentCarryingAmount	3,983,490us-gaap_DebtInstrumentCarryingAmount
Senior Notes Due September 2016
Debt
Interest rate on senior notes due (as a percent)	2.35%		2.35%
Maturity of primary debt
Long-term debt total	349,887	349,820
Senior Notes Due February 2018
Debt
Interest rate on senior notes due (as a percent)	6.15%
Maturity of primary debt
Long-term debt total	930,693	969,928
Senior Notes Due January 2019
Debt
Interest rate on senior notes due (as a percent)	9.25%	9.25%	9.25%
Maturity of primary debt
Long-term debt total	339,607	339,607
Senior Notes Due September 2020
Debt
Interest rate on senior notes due (as a percent)	5.00%
Maturity of primary debt
Long-term debt total	698,253	697,947
Senior Notes Due September 2021
Debt
Interest rate on senior notes due (as a percent)	4.625%
Maturity of primary debt
Long-term debt total	698,388	698,148
Senior Notes Due September 2023
Debt
Interest rate on senior notes due (as a percent)	5.10%		5.10%
Maturity of primary debt
Long-term debt total	$ 348,893	$ 348,765