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Real Estate (Redeemable Noncontrolling Interest) (Details) - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Redeemable Noncontrolling Interest [Line Items]    
Redeemable noncontrolling interests, carrying amount $ 10,718 $ 11,199
Redeemable noncontrolling interests, fair value 9,200 23,600
Not Currently Redeemable    
Redeemable Noncontrolling Interest [Line Items]    
Redeemable noncontrolling interests, carrying amount $ 7,200 $ 9,900