Fair Value Measurements (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended		12 Months Ended
Fair Value Measurements (Details) - USD ($) $ in Thousands	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015	Dec. 31, 2015
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Notes receivable	$ 10,480		$ 10,480		$ 10,480
Notes payable	1,364,200		1,364,200		1,699,771
Unsecured credit facilities	263,421		263,421		164,514
Provision for impairment	0	$ 0	(1,666)	$ 0
Fair Value, Measurements, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trading Securities	29,280		29,280		29,093
Available-for-sale Securities	8,017		8,017		7,922
Interest Rate Derivative Assets, at Fair Value	476		476
Total	37,773		37,773		37,015
Derivative instruments, at fair value	(1,637)		(1,637)		(20,539)
Fair Value, Measurements, Nonrecurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trading securities held in trust					0
Fair Value, Inputs, Level 1 [Member] \| Fair Value, Measurements, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trading Securities	29,280		29,280		29,093
Available-for-sale Securities	0		0		0
Interest Rate Derivative Assets, at Fair Value	0		0
Total	29,280		29,280		29,093
Derivative instruments, at fair value	0		0		0
Fair Value, Inputs, Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Notes Payable, Fair Value	1,478,100		1,478,100		1,793,200
Fair Value, Inputs, Level 2 [Member] \| Fair Value, Measurements, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trading Securities	0		0		0
Available-for-sale Securities	8,017		8,017		7,922
Interest Rate Derivative Assets, at Fair Value	476		476
Total	8,493		8,493		7,922
Derivative instruments, at fair value	(1,637)		(1,637)		(20,539)
Fair Value, Inputs, Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Notes Receivable, Fair Value	10,460		10,460		10,620
Fair Value, Inputs, Level 3 [Member] \| Fair Value, Measurements, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trading Securities	0		0		0
Available-for-sale Securities	0		0		0
Interest Rate Derivative Assets, at Fair Value	0		0
Total	0		0		0
Derivative instruments, at fair value	0		$ 0		$ 0
Unsecured Credit Facilities [Member] \| Minimum [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Risk Free Interest Rate			1.50%		1.10%
Unsecured Credit Facilities [Member] \| Maximum [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Risk Free Interest Rate			1.50%		1.10%
Unsecured Credit Facilities [Member] \| Fair Value, Inputs, Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Unsecured credit facilities, Fair Value	$ 264,800		$ 264,800		$ 165,300
Notes Payable, Other Payables [Member] \| Minimum [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Risk Free Interest Rate			2.70%		2.80%
Notes Payable, Other Payables [Member] \| Maximum [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Risk Free Interest Rate			3.80%		4.20%
Notes Receivable [Member] \| Minimum [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Risk Free Interest Rate			6.80%		6.30%
Notes Receivable [Member] \| Maximum [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Risk Free Interest Rate			6.80%		6.30%

REGENCY CENTERS LP 10-Q