Long-Term Borrowings (Minimum Annual Retirements of Long-Term Borrowings) (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Aggregate minimum annual retirements of long-term borrowings in future periods:
2018	$ 4,378
2019	33,508
2020	25,564
2021	21,979
2022	16,521
Thereafter	42,069
Long-term borrowings	$ 144,019	$ 145,155
Weighted average interest rate, 2018 retirements	1.67%
Weighted average interest rate, 2019 retirements	1.37%
Weighted average interest rate, 2020 retirements	1.84%
Weighted average interest rate, 2021 retirements	1.75%
Weighted average interest rate, 2022 retirements	1.97%
Weighted average interest rate, thereafter	2.90%
Total long-term borrowings, Weighted-Average Rate	2.04%	2.81%

Long-term Debt, Maturities, Repayments of Principal after Year Five, Weighted Average Interest Rate

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Long-term Debt, Maturities, Repayments of Principal in Next Twelve Months, Weighted Average Interest Rate

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Long-term Debt, Maturities, Repayments of Principal in Year Five, Weighted Average Interest Rate

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- Definition

Long-term Debt, Maturities, Repayments of Principal in Year Four, Weighted Average Interest Rate

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- Definition

Long-term Debt, Maturities, Repayments of Principal in Year Three, Weighted Average Interest Rate

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- Definition

Long-term Debt, Maturities, Repayments of Principal in Year Two, Weighted Average Interest Rate

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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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03(a)(16))
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-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(22))
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Amount of long-term debt payable, sinking fund requirements, and other securities issued that are redeemable by holder at fixed or determinable prices and dates maturing after the fifth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 10
-Section 50
-Paragraph 1
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-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
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-Section S99
-Paragraph 3
-Subparagraph (SX 210.12-04.(a))
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Amount of long-term debt payable, sinking fund requirements, and other securities issued that are redeemable by holder at fixed or determinable prices and dates maturing in the next fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
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-Paragraph 3
-Subparagraph (SX 210.12-04.(a))
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Amount of long-term debt payable, sinking fund requirements, and other securities issued that are redeemable by holder at fixed or determinable prices and dates maturing in the fifth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount of long-term debt payable, sinking fund requirements, and other securities issued that are redeemable by holder at fixed or determinable prices and dates maturing in the fourth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount of long-term debt payable, sinking fund requirements, and other securities issued that are redeemable by holder at fixed or determinable prices and dates maturing in the third fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount of long-term debt payable, sinking fund requirements, and other securities issued that are redeemable by holder at fixed or determinable prices and dates maturing in the second fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Weighted average interest rate of long-term debt outstanding calculated at point in time.

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