Represents the fixed charge coverage ratio.

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The contingent increase above the maximum borrowing capacity under the credit facility, if any one or more of the existing banks or new banks agree to provide such increased commitment amount.

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Maximum borrowing capacity in foreign currencies under the credit facility.

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Represents the number of quarters included in the interest margin period.

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Ratio of debt to EBITDA.

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No definition available.

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Aggregate dividends paid during the period for each share of common stock outstanding.

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Percentage points added to the reference rate to compute the variable rate on the debt instrument.

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No definition available.

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Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt.

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

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Amount, before accumulated amortization, of debt issuance costs. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs.

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Amount, after accumulated amortization, of debt issuance costs. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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No definition available.

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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 of borrowing capacity currently available under the credit facility (current borrowing capacity less the amount of borrowings outstanding).

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The fee, expressed as a percentage of the line of credit facility, for available but unused credit capacity under the credit facility.

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No definition available.

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Amount of cash outflow in the form of ordinary dividends to common shareholders of the parent entity.

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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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Debt - Credit Agreements (Details)			9 Months Ended
Debt - Credit Agreements (Details)	Oct. 09, 2018 USD ($) $ / shares	Aug. 30, 2017 USD ($) item	Sep. 30, 2018 USD ($) $ / shares	Sep. 24, 2017 USD ($)	Dec. 31, 2017 USD ($)
Debt
Outstanding debt			$ 578,600,000		$ 470,000,000
Quarterly dividend paid per common share (in dollars per share) \| $ / shares			$ 0.675
Dividends paid			$ 21,861,000	$ 22,886,000
Debt issuance costs			2,845,000		$ 3,435,000
Credit Agreement
Debt
Outstanding debt			578,600,000
Number of quarters in interest margin period \| item		4
Line of credit facility, remaining availability			166,400,000
Credit Agreement \| Maximum \| Option to increase the Revolving Facility or the Term Loan Facility
Debt
Leverage Ratio		4.00
Additional amount that company has option to increase borrowing capacity		$ 300,000,000
Credit Agreement \| LIBOR \| Minimum
Debt
Interest margin rate on debt		1.25%
Credit Agreement \| LIBOR \| Maximum
Debt
Interest margin rate on debt		2.50%
Credit Agreement \| Base rate \| Minimum
Debt
Interest margin rate on debt		0.25%
Credit Agreement \| Base rate \| Maximum
Debt
Interest margin rate on debt		1.50%
Amendment to Credit Agreement \| Subsequent event
Debt
Unamortized debt issuance costs	$ 560,000
Incurred amendment fees	$ 1,900,000
Amendment to Credit Agreement \| Subsequent event \| Leverage Ratio is greater than 3.50 to 1.00 but less than 4.50 to 1.00
Debt
Interest margin rate on debt	0.25%
Amendment to Credit Agreement \| Subsequent event \| Leverage Ratio is greater than 4.50 to 1.00
Debt
Interest margin rate on debt	0.50%
Amendment to Credit Agreement \| Minimum \| Subsequent event \| Modification of financial covenants beginning in the third quarter of 2018
Debt
Fixed charge coverage ratio	2.00
Amendment to Credit Agreement \| Minimum \| Subsequent event \| Modification of financial covenants in 2021 and thereafter
Debt
Fixed charge coverage ratio	2.50
Amendment to Credit Agreement \| Minimum \| Subsequent event \| Leverage Ratio is greater than 3.50 to 1.00 but less than 4.50 to 1.00
Debt
Leverage Ratio	3.50
Amendment to Credit Agreement \| Minimum \| Subsequent event \| Leverage Ratio is greater than 4.50 to 1.00
Debt
Leverage Ratio	4.50
Amendment to Credit Agreement \| Maximum \| Subsequent event \| Modification of financial covenants beginning in the third quarter of 2018
Debt
Leverage Ratio	5.25
Amendment to Credit Agreement \| Maximum \| Subsequent event \| Modification of financial covenants by 2022
Debt
Leverage Ratio	4.00
Amendment to Credit Agreement \| Maximum \| Subsequent event \| Ability to make dividends and distributions based on Leverage Ratio
Debt
Leverage Ratio	3.75
Quarterly dividend paid per common share (in dollars per share) \| $ / shares	$ 0.225
Dividends paid	$ 35,000,000
Amendment to Credit Agreement \| Maximum \| Subsequent event \| Removal of interest rate pricing tiers
Debt
Leverage Ratio	1.50
Amendment to Credit Agreement \| Maximum \| Subsequent event \| Leverage Ratio is greater than 3.50 to 1.00 but less than 4.50 to 1.00
Debt
Leverage Ratio	4.50
Revolving Facility \| Credit Agreement
Debt
Line of credit facility, maximum borrowing capacity		$ 600,000,000
Outstanding debt			198,600,000
Line of credit facility, maximum borrowing capacity of foreign currencies		35,000,000
Revolving Facility \| Amendment to Credit Agreement \| Subsequent event
Debt
Line of credit facility, maximum borrowing capacity	$ 400,000,000
Revolving Facility \| Amendment to Credit Agreement \| Subsequent event \| Leverage Ratio is greater than 3.50 to 1.00 but less than 4.50 to 1.00
Debt
Percentage of commitment fee on unused credit facility	0.05%
Revolving Facility \| Amendment to Credit Agreement \| Subsequent event \| Leverage Ratio is greater than 4.50 to 1.00
Debt
Percentage of commitment fee on unused credit facility	0.10%
Term Loan Facility \| Credit Agreement
Debt
Outstanding debt		400,000,000	$ 380,000,000
Quarterly amortization payment		$ 5,000,000