Deferred Revenue and Acquisition Related Liabilities, net Deferred Revenue and Acquisition Related Liabilities, net (Tables)

12 Months Ended

Dec. 31, 2012

Deferred Revenue [Abstract]

Deferred revenue and acquisition-related liabilities disclosure [Table Text Block]

Deferred revenue and acquisition-related liabilities, net consisted of the following at December 31, 2012 and 2011:

	December 31,
	2012		2011
	(in thousands)
Deferred revenue related to tenant-funded tenant improvements	$	56,461	$	41,884
Other deferred revenue	2,314		1,310
Acquisition-related intangible liabilities, net (1)	59,129		36,587
Total	$	117,904	$	79,781

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(1) See Note 4 for additional information.

Schedule of Future Amortization of Deferred Revenue [Table Text Block]

The following is the estimated amortization of deferred revenue related to tenant-funded tenant improvements as of December 31, 2012 for the next five years and thereafter:

Year Ending	(in thousands)
2013	$	10,054
2014	9,339
2015	8,255
2016	7,825
2017	6,409
Thereafter	14,579
Total	$	56,461