Real Estate Investments (Tables)

12 Months Ended

Dec. 31, 2012

Real Estate [Abstract]

Gross carrying value of the Company's Properties

	2012		2011
Land	$	662,107	$	677,891
Building and improvements	3,576,065		3,631,388
Tenant improvements	487,997		483,801
	$	4,726,169	$	4,793,080