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Fair Value Measurements (Details 1) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Total impairment losses, investment properties $ 0 $ 29,931 $ 16,440 $ 38,321
Fair Value, Measurements, Nonrecurring [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Discontinued Operation, Asset Impairment Charges 0 76,583 0 76,583
Impairment Gain (Loss) 0 106,514 16,440 114,904
Fair Value, Measurements, Nonrecurring [Member] | Fair Value, Inputs, Level 3 [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Investments, Discontinued Operations, Fair Value 0 542,208 0 542,208
Continuing Operations [Member] | Fair Value, Measurements, Nonrecurring [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Total impairment losses, investment properties 0 29,931 16,440 38,321
Continuing Operations [Member] | Fair Value, Measurements, Nonrecurring [Member] | Fair Value, Inputs, Level 3 [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Fair value, investment properties $ 0 $ 42,150 $ 36,676 $ 81,300