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Short Term Borrowings (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Feb. 28, 2019
Lines Of Credit Facility
Established Lines at Year-End	$ 9,200	$ 9,200
Maximum Amount Outstanding	48,500	2,800
Average Outstanding	37,300	18,600
Notes Payable at Year-End	$ 48,500	$ 28,000
Weighted Average Interest Rate	3.17%	2.15%
Weighted Average Interest Rate at Year-End	3.57%	2.54%
Subsequent Event [Member]
Lines Of Credit Facility
Lines of credit			$ 100,000

X

- Definition

The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement.

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Balance Type:	credit
Period Type:	instant

X

- References

No definition available.

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X

- Definition

Average amount borrowed under the credit facility during the period.

+ References

No definition available.

+ Details

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X

- Definition

The effective interest rate at the end of the reporting period.

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- Definition

The effective interest rate during the reporting period.

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- Definition

Maximum amount borrowed under the credit facility at any time during the period.

+ References

No definition available.

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X

- Definition

Maximum month-end amount borrowed under the credit facility during the period.

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Reflects the total carrying amount as of the balance sheet date of debt having initial terms less than one year or the normal operating cycle, if longer.

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