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.

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

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Fair value amount of debt instrument that was repurchased.

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Difference between the fair value of payments made and the carrying amount of debt which is extinguished prior to maturity.

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The cash inflow during the period from additional borrowings in aggregate debt. Includes proceeds from short-term and long-term debt.

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The cash outflow for debt initially having maturity due after one year or beyond the normal operating cycle, if longer.

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Public offering price as a percent of par.

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SENIOR NOTES PAYABLE AND OTHER DEBT - Senior Notes (Details) - USD ($) $ in Thousands	1 Months Ended		3 Months Ended		6 Months Ended
	Apr. 30, 2018	Feb. 28, 2018	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017	Dec. 31, 2017
Debt instruments
Senior notes payable and other debt, gross			$ 10,504,977		$ 10,504,977		$ 11,365,633
Proceeds from issuance of debt					750,316	$ 1,028,509
Gain on extinguishment of debt, net			93	$ (36)	(10,884)	$ (345)
Unsecured term loan due 2020
Debt instruments
Senior notes payable and other debt, gross			900,000		900,000		900,000
4.00% Senior Notes due 2028
Debt instruments
Senior notes payable and other debt, gross		$ 650,000	$ 650,000		$ 650,000		0
Interest rate		4.00%	4.00%		4.00%
Public offering price as percent of par		99.233%
Proceeds from issuance of debt		$ 645,000
4.00% Senior Notes due 2019
Debt instruments
Senior notes payable and other debt, gross	$ 97,900
Interest rate	4.00%	4.00%
Public offering price as percent of par		101.83%
Senior notes redeemed		$ 502,100
Gain on extinguishment of debt, net	$ 1,800	$ 11,000
2.00% Senior Notes due 2018
Debt instruments
Senior notes payable and other debt, gross			$ 0		$ 0		$ 700,000
Interest rate		2.00%	2.00%		2.00%
Repayments of long-term debt		$ 700,000