Notes Payable and Unsecured Credit Facilities (Tables)

12 Months Ended

Dec. 31, 2015

Debt Instrument [Line Items]

Schedule of Debt [Table Text Block]

	December 31,
(in thousands)	2015		2014
Notes payable:
Fixed rate mortgage loans	$	477,022	518,993
Variable rate mortgage loans (1)	34,154		29,839
Fixed rate unsecured loans	1,196,302		1,397,525
Total notes payable	1,707,478		1,946,357
Unsecured credit facilities:
Line	—		—
Term Loan	165,000		75,000
Total unsecured credit facilities	165,000		75,000
Total debt outstanding	$	1,872,478	2,021,357

Schedule of Line of Credit Facilities [Table Text Block]

he key terms of the Line and Term Loan follow:

	December 31, 2015
(in thousands)	Total Capacity			Remaining Capacity			Maturity		Variable Interest Rate (5)	Fee
Line	$	800,000	(1)	$	794,100	(2)	5/13/2019	(3)	LIBOR plus 0.925 basis points	0.150%		(4)
Term Loan	165,000			—			6/27/2019		LIBOR plus 0.975 basis points	$	35	(6)

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

cheduled principal payments and maturities on notes payable and unsecured credit facilities were as follows:

(in thousands)	December 31, 2015
Scheduled Principal Payments and Maturities by Year:	Scheduled Principal Payments		Mortgage Loan Maturities	Unsecured Maturities (1)		Total
2016	$	6,167	41,442	—		47,609
2017	5,778		117,298	300,000		423,076
2018	5,103		57,358	—		62,461
2019	4,130		106,000	165,000		275,130
2020	3,986		84,011	150,000		237,997
Beyond 5 Years	12,347		58,254	750,000		820,601
Unamortized debt premiums (discounts), net	—		9,302	(3,698	)	5,604
Total notes payable	$	37,511	473,665	1,361,302		1,872,478

Fixed Rate Mortgage Loans [Member]

Debt Instrument [Line Items]

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

As of December 31, 2015, the key terms of the Company's fixed rate notes payable are as follows:

		Fixed Interest Rates
	Maturing Through	Minimum	Maximum	Weighted Average
Secured mortgage loans	2032	3.30%	8.40%	6.10%
Unsecured public debt	2025	3.75%	6.00%	4.80%