Commitments And Contingencies (Details)	12 Months Ended							12 Months Ended
	Dec. 31, 2013 USD ($)	Dec. 31, 2012 USD ($)	Dec. 31, 2011 USD ($)	Dec. 31, 2013 Sentrum Portfolio [Member] USD ($)	Dec. 31, 2013 Sentrum Portfolio [Member] GBP (£)	Jul. 11, 2012 Sentrum Portfolio [Member] USD ($)	Jul. 11, 2012 Sentrum Portfolio [Member] GBP (£)	Dec. 31, 2013 29 A International Business Park [Member] USD ($)	Dec. 31, 2013 29 A International Business Park [Member] SGD	Dec. 31, 2013 Convergence Business Park [Member] USD ($)
Commitments and Contingencies [Line Items]
Lease term	12 years
Lease term extension	5 years
Rent expense	$ 23,100,000	$ 10,200,000	$ 8,500,000
Straight-line rent expense adjustment	10,000,000
Straight-line rent adjustments related to prior years	7,500,000
Additional performance based consideration earned (maximum)									50,000,000
Additional performance based consideration earned (maximum), adjusted for exchange rate								39,600,000
Expiration of earnout contingency								November 2020	November 2020
Lease expiration period										April 2017
Sale price of building										24,000,000
Real estate price, per square acre										225,000
Additional payment upon completion of construction by tenant						87,600,000	56,500,000
Contingent liability				64,900,000	39,200,000	87,600,000	56,500,000
Immaterial correction of purchase price allocation of investments in real estate				(5,800,000)
Change in fair value of accrued contingent consideration	(1,762,000)	1,051,000
Earnout payment				25,800,000	16,900,000
Commitments related to construction contracts	$ 202,100,000