Goodwill and Other Intangibles (Details 2) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2014
Goodwill
Balance - beginning of period	$ 350,208
Goodwill, acquired	348,972
Foreign deferred taxes adjustments	430
Allocation of goodwill to the cost basis of property classified as held-for-sale	(190)
Foreign currency translation adjustments	604
Balance - end of period	700,024
Real Estate Ownership
Goodwill
Balance - beginning of period	286,601
Goodwill, acquired	348,972
Foreign deferred taxes adjustments	430
Allocation of goodwill to the cost basis of property classified as held-for-sale	(190)
Foreign currency translation adjustments	604
Balance - end of period	636,417
Investment Management
Goodwill
Balance - beginning of period	63,607
Goodwill, acquired	0
Foreign deferred taxes adjustments	0
Allocation of goodwill to the cost basis of property classified as held-for-sale	0
Foreign currency translation adjustments	0
Balance - end of period	$ 63,607