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Fair Value Measurements And Derivative Instruments (Reconciliation Of Fair Value Liabilities Measured On Recurring Basis) (Details) - Level 3 [Member] - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Fair value, beginning of period $ (717)   $ (1,315) $ (8,682)
Net gains (losses) recognized in earnings 16   464 6,424
Purchases and issuances   150 (1,012)
Sales and settlements   1,423
Gross transfers into Level 3  
Gross transfers out of Level 3   611
Fair value, end of period (701) $ (1,236) (701) (1,236)
Total unrealized gains (losses) during the period included in earnings related to instruments held at end of period 16   464 (224)
Series E Preferred Embedded Redemption Option [Member]        
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Fair value, beginning of period 333    
Net gains (losses) recognized in earnings 4   187  
Purchases and issuances   150  
Sales and settlements    
Gross transfers into Level 3    
Gross transfers out of Level 3    
Fair value, end of period 337   337  
Total unrealized gains (losses) during the period included in earnings related to instruments held at end of period 4   187  
Series C Preferred Embedded Derivative [Member]        
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Fair value, beginning of period       (6,271)
Net gains (losses) recognized in earnings       4,848
Purchases and issuances      
Sales and settlements       1,423
Gross transfers into Level 3      
Gross transfers out of Level 3      
Fair value, end of period    
Convertible Debt [Member]        
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Fair value, beginning of period (1,050) (1,191) (1,315)
Net gains (losses) recognized in earnings 12 (45) 277 (224)
Purchases and issuances (1,012)
Sales and settlements
Gross transfers into Level 3
Gross transfers out of Level 3
Fair value, end of period (1,038) (1,236) (1,038) (1,236)
Total unrealized gains (losses) during the period included in earnings related to instruments held at end of period $ 12 (45) $ 277 (224)
Real Estate Strategies, L.P. [Member] | Warrant Derivative [Member]        
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Fair value, beginning of period       (2,411)
Net gains (losses) recognized in earnings       1,800
Purchases and issuances      
Sales and settlements      
Gross transfers into Level 3      
Gross transfers out of Level 3       611
Fair value, end of period