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Debt - E.ON Contingent Obligation (Details)
$ in Thousands
 6 Months Ended
Jun. 30, 2015
USD ($)
payment
Jun. 30, 2014
USD ($)
Dec. 31, 2014
USD ($)
Debt Instrument [Line Items]      
Unrealized gain on E.ON obligation $ 706 $ 706  
Other liabilities [Member] | E.ON Contingent Obligation - Net [Member]      
Debt Instrument [Line Items]      
E.ON contingent obligation – principal (12,902)   $ (12,902)
E.ON contingent obligation – accrued interest (5,997)   (5,291)
E.ON contingent obligation – derivative asset 18,899   18,193
E.ON contingent obligation $ 0   $ 0
Long-term Debt [Member] | E.ON Contingent Obligation - Net [Member]      
Debt Instrument [Line Items]      
Debt payment terms 72 monthly payments    
Number of monthly principal and interest payments | payment 72    
Unrealized gain on E.ON obligation $ 706 706  
Interest Expense [Member] | Long-term Debt [Member] | E.ON Contingent Obligation - Net [Member]      
Debt Instrument [Line Items]      
Interest expense recorded $ (706) $ (706)