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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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	Sep. 30, 2016	Jun. 30, 2017	Dec. 31, 2016
Debt Instrument [Line Items]
Debt Instrument, Unamortized Discount (Premium) and Debt Issuance Costs, Net				$ 4,947	$ 5,579
Long-term Debt				506,303	516,921
Current portion, long-term debt				15,000	15,000
Long-term Debt, Excluding Current Maturities				491,303	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
Long-term Debt
Debt Instrument [Line Items]
Long-term Debt, Gross				$ 86,250	$ 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
Senior unsecured notes, interest rate		3.125%
Senior unsecured notes, proceeds			$ 421,000
Term of agreement		5 years