Goodwill and Other Intangibles (Details 2) (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Jun. 30, 2014
Goodwill
Balance - beginning of period	$ 350,208
Goodwill, acquired	343,960
Adjustments to foreign deferred taxes acquired in business combinations	7,212
Allocation of goodwill to the cost basis of properties sold or classified as held-for-sale	(2,743)
Foreign currency translation adjustments	254
Balance - end of period	698,891
Real Estate Ownership
Goodwill
Balance - beginning of period	286,601
Goodwill, acquired	343,960
Adjustments to foreign deferred taxes acquired in business combinations	7,212
Allocation of goodwill to the cost basis of properties sold or classified as held-for-sale	(2,743)
Foreign currency translation adjustments	254
Balance - end of period	635,284
Investment Management
Goodwill
Balance - beginning of period	63,607
Goodwill, acquired	0
Adjustments to foreign deferred taxes acquired in business combinations	0
Allocation of goodwill to the cost basis of properties sold or classified as held-for-sale	0
Foreign currency translation adjustments	0
Balance - end of period	$ 63,607