Debt Facilities (Narrative) (Details) (USD $)	0 Months Ended		6 Months Ended
	Jul. 13, 2011	Jun. 30, 2010	Jun. 30, 2011 New Asia-Pacific Financing [Member]	Jun. 30, 2011 Paris 4 IBX Financing [Member]
Received additional advances, approximation			$ 77,917,000
Financing leaving the amount available to borrowing, approximation			17,679,000
Senior notes stated percentage		3.00%	5.19%	5.90%
Line of credit facility, amount outstanding, approximation				21,779,000
Line of credit facility payments made, approximation				35,687,000
Line of credit facility payments due, approximation				95,983,000
Line of credit facility remaining borrowing capacity				112,998,000
Line of credit facility amounts allocated to land and building assets				14,951,000
Line of credit facility amounts allocated to deferred charge				3,721,000
Line of credit facility, collateral fees, amount, approximation				96,876,000
Credit facility agreement, approximation				$ 109,892,000
Debt instrument maturity date	July 15, 2021