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Litigation Funding Agreement (Details) - USD ($)
$ in Thousands
1 Months Ended 12 Months Ended
Mar. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Litigation Funding Agreement [Abstract]      
Legal expenses attributable to the Litigation Funding Agreement   $ 1,511 $ 0
R. A. Bianco [Member]      
Litigation Fund [Line Items]      
Litigation fund   $ 7,000  
R. A. Bianco [Member] | Minimum [Member]      
Litigation Fund [Line Items]      
Percentage of recovery sharing ratio   30.00%  
R. A. Bianco [Member] | Maximum [Member]      
Litigation Fund [Line Items]      
Percentage of recovery sharing ratio   45.00%  
R. A. Bianco [Member] | Subsequent Event [Member]      
Litigation Funding Agreement [Abstract]      
Additional amount funded for legal expenses $ 588