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Senior Notes Carrying value of the Senior Notes (Details) - USD ($)	Dec. 31, 2018	May 31, 2018	Dec. 31, 2017
Debt Instrument [Line Items]
Debt issuance costs, net of accumulated amortization of $44	$ (955,000)		$ (967,000)
Accumulated Amortization, Debt Issuance Costs	4,442,000		$ 4,138,000
Senior Notes [Member]
Debt Instrument [Line Items]
Principal amount	325,000,000	$ 325,000,000
Debt discount, net of accumulated amortization of $154	(4,602,000)
Debt issuance costs, net of accumulated amortization of $44	(1,290,000)
Carrying value of the Senior Notes	$ 319,108,000

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