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Debt Debt (Convertible Debt Roll Forward) (Details) - USD ($)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Unamortized Debt Issuance Expense, January 1	$ (9,884,000)
Convertible Debt, January 1	118,609,000
Repayments of Convertible Debt	(60,285,000)
Unamortized Debt Issuance Costs, Debt Redemption, Allocation	210,000
Amortization of Debt Issuance Costs	5,117,000	$ 4,437,000	$ 5,790,000
Debt Instrument, Unamortized Discount, December 31	(1,541,000)
Unamortized Debt Issuance Expense, December 31	(7,076,000)	(9,884,000)
Convertible Debt, December 31	59,697,000	118,609,000
Convertible Debt [Member]
Debt Instrument, Face Amount, January 1	120,000,000
Debt Instrument, Unamortized Discount, January 1	(1,391,000)
Unamortized Debt Issuance Expense, January 1	(910,000)
Amortization of Debt Discount (Premium)	760,000
Amortization of Debt Issuance Costs	505,000
Debt Instrument, Face Amount, December 31	60,000,000	120,000,000
Debt Instrument, Unamortized Discount, December 31	(303,000)	(1,391,000)
Unamortized Debt Issuance Expense, December 31	(195,000)	(910,000)
Convertible Debt, Net of Debt Issuance Costs [Member]
Convertible Debt, January 1	117,699,000
Convertible Debt, December 31	59,502,000	$ 117,699,000
Allocated to Debt [Member]
Repayments of Convertible Debt	(60,000,000)
Unamortized Debt Discount, Debt Redemption, Allocation	$ 328,000

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This item represents the amount of unamortized debt discount which was allocated to the portion of outstanding debt redeemed during the period.

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This item represents the unamortized debt issuance costs allocated to the portion of debt that was redeemed during the period.

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Amount of noncash expense included in interest expense to amortize debt discount and premium associated with the related debt instruments. Excludes amortization of financing costs. Alternate captions include noncash interest expense.

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Amount of amortization expense attributable to debt issuance costs.

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Including the current and noncurrent portions, carrying amount of debt identified as being convertible into another form of financial instrument (typically the entity's common stock) as of the balance sheet date, which originally required full repayment more than twelve months after issuance or greater than the normal operating cycle of the company.

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

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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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