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Face (par) amount of debt instrument at time of issuance.

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Description of the frequency of periodic payments (monthly, quarterly, annual).

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Contractual interest rate for funds borrowed, under the debt agreement.

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Amount of the required periodic payments including both interest and principal payments.

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Amount of payment greater than the preceding installment payments to be paid at final maturity date of debt.

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Period of time between issuance and maturity of debt instrument, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Date the credit facility terminates, in CCYY-MM-DD format.

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Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

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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 cash outflow for a borrowing having initial term of repayment within one year or the normal operating cycle, if longer.

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Amount of stock repurchase plan authorized.

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The ratio of consolidated EBITDA to consolidated interest charges for the most recently completed four fiscal quarters.

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The ratio of consolidated funded indebtedness as of termination date to consolidated EBITDA for the most recently completed four fiscal quarters.

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Senior Notes, Additional Maximum Borrowing Capacity

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Debt (Narrative) (Details) - USD ($)	1 Months Ended		3 Months Ended
Debt (Narrative) (Details) - USD ($)	Dec. 31, 2017	Nov. 30, 2017	Nov. 30, 2017	Nov. 15, 2017	Aug. 31, 2017
Debt Instrument [Line Items]
Current debt		$ 10,800,000	$ 10,800,000		$ 20,000,000
Line of credit, long-term liability		153,200,000	153,200,000		$ 134,000,000
Fifth Amended Credit Facility [Member]
Debt Instrument [Line Items]
Revolving credit facility, amount		175,000,000	175,000,000
Share buy-back plan, amount authorized		$ 150,000,000	$ 150,000,000
Revolving credit facility, expiration date			May 13, 2020
Consolidated leverage ratio		3	3
Consolidated interest coverage ratio		3	3
Autoborrow Agreement [Member]
Debt Instrument [Line Items]
Current debt		$ 0	$ 0
Revolving Credit Facility [Member] \| Line Of Credit, Headquarters Office [Member]
Debt Instrument [Line Items]
Additional maximum borrowing capacity		$ 0	$ 0
Note Agreement [Member]
Debt Instrument [Line Items]
Principal payment frequency of periodic payment			semi-annually
Note Agreement [Member] \| Series A Notes [Member]
Debt Instrument [Line Items]
Revolving credit facility, amount				$ 20,000,000
Principal amount				$ 20,000,000
Interest rate		3.39%	3.39%
Maturity date			Nov. 15, 2032
Date of first payment required			May 15, 2018
Periodic payment amount			$ 400,000
Date of final semi-annual payment required			May 15, 2032
Balloon payment		$ 8,400,000	$ 8,400,000
Note Agreement [Member] \| Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Repayment of short-term debt	$ 10,000,000	10,000,000	20,000,000
Shelf Notes [Member]
Debt Instrument [Line Items]
Principal amount		0	$ 0
Latest date to issue senior notes			Nov. 15, 2020
Period of debt issuance and maturity			15 years 6 months
Maximum [Member] \| Shelf Notes [Member]
Debt Instrument [Line Items]
Additional maximum borrowing capacity		$ 105,000,000	$ 105,000,000