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Long - Term Debt - Credit Facilities 5 (Details) - USD ($)
$ in Thousands
 10 Months Ended 12 Months Ended
Oct. 31, 2017
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Line of Credit Facility [Line Items]        
Amount drawn down   $ 8,125 $ 54,800 $ 0
Repayment of long term debt, first year   64,088    
Repayment of long term debt, second year   330,033    
Outstanding amount   $ 889,176    
$54.8 Million Citi Credit Facility [Member]        
Line of Credit Facility [Line Items]        
Line of credit facility issuance date   Oct. 26, 2017    
Line of credit facility maximum borrowing capacity   $ 54,800    
Amount drawn down $ 54,800      
Line of Credit Facility, Expiration Date   Oct. 31, 2020    
Line of Credit Facility, Interest Rate Description   LIBOR plus a margin    
Loan margin percentage   3.25%    
Line of Credit Facility, Frequency of Payments   at least quarterly    
Minimum cash balance requirement   $ 20,000    
Outstanding amount   34,800    
$54.8 Million Citi Credit Facility [Member] | Minimum [Member]        
Line of Credit Facility [Line Items]        
Repayment of long term debt, first year   20,000    
Repayment of long term debt, second year   $ 20,000