Results by Quarter (Tables)

12 Months Ended

Dec. 31, 2012

Summary of Results by Quarter

	First Quarter		Second Quarter		Third Quarter		Fourth Quarter
Year ended December 31, 2012
Rental revenues	$	179,443	$	184,786	$	188,947	$	184,548
Net income		134,641		163,795		172,060		163,666
Net income per limited partnership unit		15.23		18.53		19.47		18.51
Year ended December 31, 2011
Rental revenues	$	182,124	$	184,013	$	185,760	$	182,063
Net income		137,271		164,789		163,485		145,266
Net income per limited partnership unit		15.53		18.64		18.50		16.43