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Fair Value Measurements (Details 2) - Level 3 - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Dec. 31, 2016
Convertible Securities      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Asset, Beginning Balance $ 3,294 $ 13,550  
Realized gains (losses) included in earnings 0 710  
Sales proceeds 0 (13,485)  
Asset, Ending Balance 3,294 775  
Convertible Notes | Cost Basis, Plus Interest      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Asset, Beginning Balance 3,294    
Asset, Ending Balance 3,294 775  
Real Property | Third-Party Appraisal      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Assets, Fair Value Disclosure, Nonrecurring 11,210   $ 11,210
Contingent Consideration      
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]      
Liability, Beginning Balance 0 (350)  
Gains (losses) included in earnings 0 190  
Sales proceeds 0 0  
Liability, Ending Balance $ 0 $ (160)