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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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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Amount of unamortized debt discount (premium) and debt issuance costs.

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The fair value of line of credit assumed in noncash investing or financing activities.

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Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt, classified as current. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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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 inflow from the issuance of long-term debt that is not secured by collateral. Excludes proceeds from tax exempt unsecured debt.

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Long-Term Debt (Details) - USD ($) $ in Thousands			1 Months Ended	3 Months Ended
Long-Term Debt (Details) - USD ($) $ in Thousands	Jun. 15, 2021	Jun. 30, 2016	Jun. 30, 2016	Sep. 30, 2016	Sep. 30, 2017	Dec. 31, 2016
Debt Instrument [Line Items]
Unamortized discounts and issuance costs of unsecured notes					$ 4,631	$ 5,579
Long-term Debt					420,369	516,921
Current portion, long-term debt					0	15,000
Long-term debt					420,369	501,921
Senior unsecured notes, maturity date	Jun. 15, 2021
Line of Credit Assumed				$ 105,000
Unsecured notes
Debt Instrument [Line Items]
Long-term Debt, Gross					425,000	425,000
Credit Agreement [Member]
Debt Instrument [Line Items]
Long-term Debt, Gross					$ 0	$ 97,500
Three Point One Two Five Percent Senior Unsecured Notes Due June Fifteenth Twenty Twenty Five [Domain]
Debt Instrument [Line Items]
Senior unsecured notes, issued amount		$ 425,000	$ 425,000
Senior unsecured notes, interest rate		3.125%	3.125%
Senior unsecured notes, proceeds		$ 421,000
Term of agreement			5 years