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Senior Notes Carrying value of the Senior Notes (Details) - USD ($)
Dec. 31, 2019
Dec. 19, 2019
Dec. 31, 2018
May 31, 2018
Debt Instrument [Line Items]        
Debt issuance costs, net of accumulated amortization of $44 $ (1,618,000)   $ (955,000)  
Accumulated Amortization, Debt Issuance Costs 4,442,000   4,138,000  
Senior Notes [Member]        
Debt Instrument [Line Items]        
Principal amount 400,000,000     $ 325,000,000
Debt premium 1,688,000      
Debt discount, net of accumulated amortization of $154 (4,110,000)   (4,602,000)  
Debt issuance costs, net of accumulated amortization of $44 (2,131,000)   (1,290,000)  
Carrying value of the Senior Notes 395,447,000   319,108,000  
Senior Notes [Member] | Senior Note Two [Member]        
Debt Instrument [Line Items]        
Principal amount 400,000,000 $ 75,000,000 325,000,000  
Debt premium $ 1,688,000   $ 0