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Severance Expense (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Related Party Transaction [Line Items]      
Severance expense $ 5,938 $ 0 $ 0
Employee Severance [Member] | Expected Cash Payment [Member] | Chief Investment Officer [Member]      
Related Party Transaction [Line Items]      
Severance expense 2,600    
Employee Severance [Member] | Taxes and Other Expenses [Member] | Chief Investment Officer [Member]      
Related Party Transaction [Line Items]      
Severance expense 100    
Nonvested Shares [Member] | Employee Severance [Member] | Accelerated Vesting of Shares [Member] | Chief Investment Officer [Member]      
Related Party Transaction [Line Items]      
Severance expense $ 3,200