Long Term Debt (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Debt Instrument [Line Items]
Long-term Debt and Lease Obligation, Including Current Maturities	$ 777,256	$ 768,807
Finance Lease, Liability	686	836
Current portion of long-term debt	16,805	13,596
Long-term debt	760,451	755,211
Line of Credit [Member]
Debt Instrument [Line Items]
Long-term Debt	230,000	220,000
Term Loan Facility [Member]
Debt Instrument [Line Items]
Long-term Debt	243,563	253,535
Unamortized Debt Issuance Expense	1,562	1,528
Convertible Notes Payable [Member]
Debt Instrument [Line Items]
Convertible Debt	303,007	294,436
Debt Instrument, Unamortized Discount	36,073	43,312
Unamortized Debt Issuance Expense	$ 5,920	$ 7,252

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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Present value of lessee's discounted obligation for lease payments from finance lease.

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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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