Business Combination, Contingent Consideration Arrangements, Fair Value Adjustment

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Commitments and Contingencies [Line Items]

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Performance Based Commitments Maximum Consideration

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Real Estate Price Per Square Acre

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Amount of increase (decrease) in the value of a contingent consideration liability, including, but not limited to, differences arising upon settlement.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 30
-Section 50
-Paragraph 4
-Subparagraph (a)(1)
-URI http://asc.fasb.org/extlink&oid=35744584&loc=d3e7008-128479

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The amount of liability arising from an inherited contingency (as defined) which has been recognized as of the acquisition date.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=73530397&loc=d3e4845-128472

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Minimum amount to be expended to satisfy the terms of arrangements in which the entity has agreed to expend funds to procure goods or services, excluding long-term purchase commitments or unconditional purchase obligations.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
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-Topic 942
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Carrying amount as of the balance sheet date of investments in land and buildings held for sale, excluding real estate considered to be inventory of the entity.

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Commitments and Contingencies (Details) $ in Thousands, £ in Millions	3 Months Ended
	Mar. 31, 2016 USD ($)	Mar. 31, 2016 SGD	Mar. 31, 2015 USD ($)	Mar. 31, 2015 GBP (£)	Dec. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)	Jul. 11, 2012 USD ($)	Jul. 11, 2012 GBP (£)
Commitments and Contingencies [Line Items]
Change in fair value of contingent consideration	$ 0		$ 43,034
Commitments related to construction contracts	209,900
Sentrum Portfolio
Commitments and Contingencies [Line Items]
Contingent liability							$ 87,600	£ 56.5
Reduction in fair value			$ 45,900	£ 30.3
Change in fair value of contingent consideration	43,000
29A International Business Park
Commitments and Contingencies [Line Items]
Additional performance based consideration earned (maximum)	37,100	SGD 50,000,000.0
Contingent liability					$ 19,400	$ 12,600
Convergence Business Park
Commitments and Contingencies [Line Items]
Sale price of building	24,000
Real estate price, per square acre	$ 225