Debt Debt (Tables)

12 Months Ended

Dec. 31, 2014

Debt [Abstract]

Schedule of Long-term Debt Instruments [Table Text Block]

The following tables summarize the Company’s unsecured note balances and certain interest rate and maturity date information as of and for the years ended December 31, 2014 and 2013, respectively:

December 31, 2014  (Amounts in thousands)	Net Principal Balance		Interest Rate Ranges	Weighted Average Interest Rate	Maturity Date Ranges
Fixed Rate Public Notes (1)	$	4,974,154	3.00% - 7.57%	5.45%	2015 - 2044
Floating Rate Public Notes (1)	451,192		(1)	1.15%	2019
Totals	$	5,425,346

December 31, 2013 (Amounts in thousands)	Net Principal Balance		Interest Rate Ranges	Weighted Average Interest Rate	Maturity Date Ranges
Fixed Rate Public/Private Notes	$	4,727,088	3.00% - 7.57%	5.55%	2014 - 2026
Floating Rate Public/Private Notes (2)	750,000		(2)	1.58%	2015
Totals	$	5,477,088

(1) Fair value interest rate swaps convert the $450.0 million2.375% notes due July 1, 2019 to a floating interest rate of 90-Day LIBOR plus 0.61%.

(2) Includes the Company's senior unsecured $750.0 million term loan facility that was to mature on January 11, 2015 and was paid off in the second quarter of 2014. The interest rate on advances under the term loan facility was generally LIBOR plus a spread (1.20%), which was dependent on the credit rating of the Company's long-term debt.

Aggregate payments of principal on unsecured notes payable

The following table provides a summary of the aggregate payments of principal on all debt for each of the next five years and thereafter (amounts in thousands):

Year	Total (1)
2015	$	408,420
2016	1,192,798
2017	1,346,708
2018	514,510
2019	1,278,469
Thereafter	6,135,842
Net Unamortized (Discount)	(31,886		)
Total	$	10,844,861

(1) Premiums and discounts are amortized over the life of the debt.