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Long Term Debt (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Debt Instrument [Line Items]
Long-term Debt and Lease Obligation, Including Current Maturities	$ 715,586	$ 753,636
Finance Lease, Liability	638	587
Current portion of long-term debt	12,251	18,415
Long-term debt	703,335	735,221
Line of Credit [Member]
Debt Instrument [Line Items]
Long-term Debt	171,000	207,000
Term Loan Facility [Member]
Debt Instrument [Line Items]
Long-term Debt	229,102	240,145
Unamortized Debt Issuance Expense	1,448	1,668
Convertible Notes Payable [Member]
Debt Instrument [Line Items]
Convertible Debt	314,846	305,904
Debt Instrument, Unamortized Discount	26,009	33,620
Unamortized Debt Issuance Expense	$ 4,144	$ 5,475

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- Definition

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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Amount, after accumulated amortization, of debt discount.

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

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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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