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Long Term Debt (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Debt Instrument [Line Items]
Long-term Debt and Lease Obligation, Including Current Maturities	$ 753,636	$ 768,807
Current portion of long-term debt	18,415	13,596
Financing leases	587	836
Long-term debt	735,221	755,211
Revolving Line of Credit [Member]
Debt Instrument [Line Items]
Total long-term debt	207,000	220,000
Term Loan Facility [Member]
Debt Instrument [Line Items]
Total long-term debt	240,145	253,535
Unamortized Debt Issuance Expense	1,668	1,528
Convertible Notes Payable [Member]
Debt Instrument [Line Items]
Convertible Debt	305,904	294,436
Unamortized Debt Issuance Expense	5,475	7,252
Debt Instrument, Unamortized Discount	$ 33,620	$ 43,312

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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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Amount of long-term debt and lease obligation, classified as noncurrent.

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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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