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Fair Value Measurements (Details 1) - Level 3 - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Dec. 31, 2017
Convertible preferred securities (a)      
Reconciliation of Fair Value Measurements Using Level 3      
Asset (liability), Beginning Balance $ 7,388 $ 3,294  
Gains (losses) included in earnings 0 0  
Asset (liability), Ending Balance 7,388 3,294  
Convertible preferred securities (a) | Implied based on market prices      
Quantitative Information about Level 3 Fair Value Measurements      
Convertible preferred securities (a) 7,388 $ 3,294 $ 7,388
Real Property | Third-Party Appraisal      
Quantitative Information about Level 3 Fair Value Measurements      
Real Property (b) $ 29,347   $ 29,347