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Consolidated interest coverage ratio actual.

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Consolidated interest coverage ratio covenant.

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Consolidated leverage ratio maximum.

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Consolidated tangible net worth actual.

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Consolidated tangible net worth covenant.

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Debt instrument redemption price percentage of principal amount required to be redeemed.

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

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

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

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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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The total amount of the contingent obligation under letters of credit outstanding as of the reporting date.

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Amount of current borrowing capacity under the credit facility considering any current restrictions on the amount that could be borrowed (for example, borrowings may be limited by the amount of current assets), but without considering any amounts currently outstanding under the facility.

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

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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 carrying value as of the balance sheet date of the current portion 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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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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Long-Term Debt and Credit Arrangements - Additional Information (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Dec. 31, 2018	May 31, 2018	Mar. 31, 2018
Debt Instrument [Line Items]
Long-term Debt, Maturities, Repayments of Principal in the Remainder of 2019	$ 45,600
Long-term Debt, Maturities, Repayments of Principal in 2020	7,500
Long-term Debt, Maturities, Repayments of Principal in 2021	7,500
Long-term Debt, Maturities, Repayments of Principal in 2022	7,500
Long-term Debt, Maturities, Repayments of Principal in 2023	313,300
Current maturities of long-term debt	47,281	$ 47,286		$ 47,298
Long-term debt	333,290	335,119		176,011
Letters of Credit Outstanding, Amount	32,500
Consolidated Tangible Net Worth, Actual	$ 1,100,000
Consolidated Leverage Ratio, Maximum	3.00
Consolidated Interest Coverage Ratio, Actual	11.70
Consolidated Interest Coverage Ratio, Covenant	4.00
Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Line of Credit Facility, Remaining Borrowing Capacity			$ 350,000
Line of Credit, Current	$ 197,000	197,000		55,000
Senior Notes [Member] \| 2019 Notes [Member]
Debt Instrument [Line Items]
Debt instrument, face amount	$ 40,000	40,000		80,000
Debt instrument, interest rate, stated percentage	6.11%
Current maturities of long-term debt	$ 40,000	40,000		40,000
Term Loan [Member]
Debt Instrument [Line Items]
Debt instrument, face amount			$ 150,000
Current maturities of long-term debt	7,500	7,500		7,500
Long-term debt	144,400
Long-term debt	$ 136,900	$ 138,800		$ 81,300
Debt instrument redemption price percentage required to repay	1.25%	1.25%
Line of Credit [Member]
Debt Instrument [Line Items]
Line of Credit Facility, Current Borrowing Capacity	$ 120,500
Consolidated Tangible Net Worth, Covenant	$ 794,200
Adjusted Consolidated Leverage Ratio, Actual	1.96
Line of Credit [Member] \| LIBOR [Member]
Debt Instrument [Line Items]
Debt Instrument, Basis Spread on Variable Rate	1.63%
Line of Credit Facility, Interest Rate at Period End	4.22%
Line of Credit [Member] \| Base Rate [Member]
Debt Instrument [Line Items]
Debt Instrument, Basis Spread on Variable Rate	0.63%
Line of Credit Facility, Interest Rate at Period End	6.13%