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Fair Value Measurements (Details 1) - Level 3 - USD ($)
$ in Thousands
3 Months Ended
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2016
Convertible preferred securities (a)              
Reconciliation of Fair Value Measurements Using Level 3              
Asset (liability), Beginning Balance $ 3,294 $ 3,294 $ 3,294 $ 3,294 $ 775 $ 13,550  
Gains (losses) included in earnings   0 0   19 710  
Unrealized gains (losses) included in other comprehensive income 344     0      
Sales proceeds     0     (13,485)  
New investments 3,000 0   0 2,500    
Asset (liability), Ending Balance 6,638 3,294 3,294 3,294 3,294 775  
Convertible preferred securities (a) | Implied based on market prices              
Quantitative Information about Level 3 Fair Value Measurements              
Convertible preferred securities (a) 6,638     3,294     $ 3,294
Real Property | Third-Party Appraisal              
Quantitative Information about Level 3 Fair Value Measurements              
Real Property             $ 11,210
Contingent Consideration              
Reconciliation of Fair Value Measurements Using Level 3              
Asset (liability), Beginning Balance 0 0 0 0 (160) (350)  
Gains (losses) included in earnings   0 0   160 190  
Unrealized gains (losses) included in other comprehensive income 0     0      
Sales proceeds     0     0  
New investments 0 0   0 0    
Asset (liability), Ending Balance $ 0 $ 0 $ 0 $ 0 $ 0 $ (160)