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Fair Value Measurements (Details 1) - Level 3 - USD ($)
$ in Thousands
3 Months Ended
Jun. 30, 2017
Mar. 31, 2017
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2016
Convertible Securities          
Reconciliation of Fair Value Measurements Using Level 3          
Asset (liability), Beginning Balance   $ (3,294)   $ (13,550)  
Gains (losses) included in earnings $ 0 0 $ 19 710  
Sales proceeds   0   (13,485)  
New agreements 0   2,500    
Asset (liability), Ending Balance (3,294)   (775)    
Convertible Notes | Cost Basis, Plus Interest          
Quantitative Information about Level 3 Fair Value Measurements          
Convertible Notes 3,294   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   (350)  
Gains (losses) included in earnings 0 0 160 190  
Sales proceeds   $ 0   $ 0  
New agreements 0   0    
Asset (liability), Ending Balance $ 0   $ (160)