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Long Term Debt (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Debt Instrument [Line Items]
Unamortized Debt Issuance Expense	$ 311	$ 467
Total long-term debt	456,900	486,443
Current portion of long-term debt	18,336	14,699
Long-term debt	438,564	471,744
Revolving Line of Credit [Member]
Debt Instrument [Line Items]
Total long-term debt	312,000	327,000
Term Loan Facility [Member]
Debt Instrument [Line Items]
Total long-term debt	144,064	157,033
Mortgages Notes [Member]
Debt Instrument [Line Items]
Total long-term debt	$ 836	$ 2,410

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

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Amount after unamortized (discount) premium and debt issuance costs of long-term debt classified as noncurrent and excluding amounts to be repaid within one year or the normal operating cycle, if longer. 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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