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Senior Notes Carrying value of the Senior Notes (Details) - USD ($)
Mar. 31, 2019
Dec. 31, 2018
Debt Instrument [Line Items]    
Debt issuance costs, net of accumulated amortization of $77 and $111, respectively $ (901,000) $ (955,000)
Accumulated Amortization, Debt Issuance Costs 162,000 109,000
Senior Notes [Member]    
Debt Instrument [Line Items]    
Principal amount 325,000,000 325,000,000
Debt discount, net of accumulated amortization of $273 and $392, respectively (4,483,000) (4,602,000)
Debt issuance costs, net of accumulated amortization of $77 and $111, respectively (1,256,000) (1,290,000)
Carrying value of the Senior Notes 319,261,000 319,108,000
Accumulated amortization, debt discount 392,000 273,000
Accumulated Amortization, Debt Issuance Costs $ 111,000 $ 77,000