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Fair Value Measurements and Derivative Instruments (Reconciliation of Items Measured at Fair Value on a Recurring Basis) (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Series E Preferred Embedded Redemption Option [Member]        
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Realized (gains) losses    
Sales and settlements    
Gross transfers into Level 3    
Gross transfers out of Level 3    
Convertible Debt [Member]        
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Realized (gains) losses      
Sales and settlements      
Gross transfers into Level 3      
Gross transfers out of Level 3      
Level 3 [Member]        
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Fair value, beginning of period (769) (982) $ (755) $ (1,315)
Net gains (losses) recognized in earnings (15) 265 (29) 448
Purchases and issuances   150
Realized (gains) losses    
Sales and settlements    
Gross transfers into Level 3    
Gross transfers out of Level 3    
Fair value, end of period (784) (717) (784) (717)
Total unrealized gains (losses) during the period included in earnings related to instruments held at end of period (15) 265 (29) 448
Level 3 [Member] | Series E Preferred Embedded Redemption Option [Member]        
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Fair value, beginning of period 280 93 314
Net gains (losses) recognized in earnings (14) 240 (48) 183
Purchases and issuances   150
Realized (gains) losses    
Sales and settlements    
Gross transfers into Level 3    
Gross transfers out of Level 3    
Fair value, end of period 266 333 266 333
Total unrealized gains (losses) during the period included in earnings related to instruments held at end of period (14) 240 (48) 183
Level 3 [Member] | Convertible Debt [Member]        
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Fair value, beginning of period (1,049) (1,075) (1,069) (1,315)
Net gains (losses) recognized in earnings (1) 25 19 265
Purchases and issuances    
Realized (gains) losses    
Sales and settlements    
Gross transfers into Level 3    
Gross transfers out of Level 3    
Fair value, end of period (1,050) (1,050) (1,050) (1,050)
Total unrealized gains (losses) during the period included in earnings related to instruments held at end of period $ (1) $ 25 $ 19 $ 265