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Debt - Convertible Notes (Details) - 3.00% Convertible senior notes due 2022 - Convertible debt - USD ($)	Sep. 30, 2018	Dec. 31, 2017	Aug. 31, 2015
Long-term debt
Principal	$ 150,000,000	$ 150,000,000	$ 150,000,000.0
Less: Debt issuance costs	(1,844,000)	(2,121,000)
Less: Debt discount, net	(37,009,000)	(42,572,000)
Net carrying amount	$ 111,147,000	$ 105,307,000

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

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Amount, after accumulated amortization, of debt discount.

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Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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The remaining balance of debt issuance expenses that were capitalized and are being amortized against income over the lives of the respective bond issues. This does not include the amounts capitalized as part of the cost of the utility plant or asset.

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