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Senior Notes Carrying value of the Senior Notes (Details) - USD ($)
Jun. 30, 2019
Dec. 31, 2018
Debt Instrument [Line Items]    
Debt issuance costs, net of accumulated amortization of $77 and $145, respectively $ (847,000) $ (955,000)
Accumulated Amortization, Debt Issuance Costs 216,000 109,000
Senior Notes [Member]    
Debt Instrument [Line Items]    
Principal amount 325,000,000 325,000,000
Debt discount, net of accumulated amortization of $273 and $515, respectively (4,360,000) (4,602,000)
Debt issuance costs, net of accumulated amortization of $77 and $145, respectively (1,222,000) (1,290,000)
Carrying value of the Senior Notes 319,418,000 319,108,000
Accumulated amortization, debt discount 515,000 273,000
Accumulated Amortization, Debt Issuance Costs $ 145,000 $ 77,000