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Financing Instruments Financing Instruments - Summary of Long-Term Debt (Details) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Debt Instrument [Line Items]    
Outstanding balance on loan $ 9,000 $ 14,424
Debt Instrument, Unamortized Discount (Premium) And Debt Issuance Costs, Net (55) (287)
Long-term Debt $ 8,945 14,137
Secured Debt [Member]    
Debt Instrument [Line Items]    
Effective interest rate (percent) 11.66%  
Outstanding balance on loan $ 0 7,688
Line of Credit [Member] | Line of Credit [Member]    
Debt Instrument [Line Items]    
Effective interest rate (percent) 2.78%  
Outstanding balance on loan $ 9,000 0
Line of Credit [Member] | Revolving Credit Facility [Member]    
Debt Instrument [Line Items]    
Effective interest rate (percent) 4.60%  
Outstanding balance on loan $ 0 $ 6,736