Fair Value of Financial Instruments (Tables)

12 Months Ended

Dec. 31, 2013

Fair Value Disclosures [Abstract]

Schedule of financial instruments with fair values different from their carrying amount

	December 31, 2013				December 31, 2012
	Carrying Amount		Fair Value		Carrying Amount		Fair Value
Mortgage notes payable	$	669,762	$	715,244	$	443,942	$	486,412
Unsecured notes payable	$	1,401,093	$	1,471,041	$	1,430,343	$	1,553,123
Variable rate debt	$	528,610	$	526,693	$	597,610	$	595,693
Notes receivable	$	7,026	$	7,759	$	7,226	$	7,783