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Debt (Details 2) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2013 2.35% senior notes due September 2016	Sep. 30, 2013 2.35% senior notes due September 2016	Dec. 31, 2013 6.15% senior notes due February 2018	Dec. 31, 2012 6.15% senior notes due February 2018	Dec. 31, 2013 9.25% senior notes due January 2019	Dec. 31, 2012 9.25% senior notes due January 2019	Dec. 31, 2013 5.00% senior notes due September 2020	Dec. 31, 2012 5.00% senior notes due September 2020	Dec. 31, 2013 4.625% senior notes due September 2021	Dec. 31, 2012 4.625% senior notes due September 2021
Debt
Interest rate on senior note due (as a percent)			2.35%	2.35%	6.15%		9.25%		5.00%		4.625%
Maturity of primary debt
2016	$ 350,000
2017	499,844
2018	975,000
Thereafter	2,089,607
Long-term debt total	$ 3,983,490	$ 4,448,888	$ 349,820		$ 969,928	$ 968,708	$ 339,607	$ 1,125,000	$ 697,947	$ 697,648	$ 698,148	$ 697,907

X

- Definition

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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