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Debt Bank loan (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Oct. 12, 2017
Jul. 14, 2016
Oct. 15, 2015
Jan. 05, 2015
Debt Instrument [Line Items]            
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Gain (Loss) Included in Earnings $ (2,100)          
Change in fair value of debt attributable to instrument-specific credit risk 3,804 $ 0        
Loss on change in fair value of debt (1,720) (8,487)        
Debt Instrument, Principal Value 284,340 288,732        
Debt Instrument, Interest Rate, Stated Percentage       4.07% 10.25% 4.81%
Notes Payable to Bank 3,917 4,917        
Notes Payable to Banks [Member]            
Debt Instrument [Line Items]            
Debt Instrument, Principal Value $ 3,917 $ 4,917 $ 5,000      
Debt Instrument, Interest Rate, Stated Percentage     5.00%