Senior Notes Carrying value of the Senior Notes (Details) - USD ($)	Sep. 30, 2018	Dec. 31, 2017
Debt Instrument [Line Items]
Debt issuance costs, net of accumulated amortization of $44	$ 0	$ (967,000)
Accumulated Amortization, Debt Issuance Costs	4,518,000	$ 4,442,000
Senior Notes [Member]
Debt Instrument [Line Items]
Principal amount	325,000,000
Debt discount, net of accumulated amortization of $154	(4,721,000)
Debt issuance costs, net of accumulated amortization of $44	(1,323,000)
Carrying value of the Senior Notes	318,956,000
Accumulated amortization, debt discount	38,000
Accumulated Amortization, Debt Issuance Costs	$ 11,000

Accumulated Amortization, Debt Discount

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Amount of accumulated amortization of debt issuance costs.

+ References

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Face (par) amount of debt instrument at time of issuance.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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No definition available.

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Amount, after accumulated amortization, of debt discount (premium).

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Amount, after accumulated amortization, of debt issuance costs. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs.

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Including the current and noncurrent portions, carrying value as of the balance sheet date of Notes with the highest claim on the assets of the issuer in case of bankruptcy or liquidation (with maturities initially due after one year or beyond the operating cycle if longer). Senior note holders are paid off in full before any payments are made to junior note holders.

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