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Long-Term Debt, Schedule of Long-Term Debt (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Long-term debt [Abstract]
Long-term Debt	$ 1,417,392	$ 995,848
Unamortized debt issuance costs	(6,550)	(3,442)
Unamortized debt discount	(654)	0
Total	1,410,188	992,406
Bank Notes Payable [Member]
Long-term debt [Abstract]
Long-term Debt	19	3
Revolving Credit Facility Due June 26, 2022 [Member]
Long-term debt [Abstract]
Long-term Debt	$ 417,373	495,845
Credit facility, expiration date	Jun. 26, 2022
Long term debt, face amount	$ 850,000
Senior Notes Series A Due February 27, 2020 [Member]
Long-term debt [Abstract]
Long-term Debt	$ 150,000	150,000
Debt maturity date	Feb. 27, 2020
Long term debt, face amount	$ 150,000
Senior Notes Series B Due February 27, 2023 [Member]
Long-term debt [Abstract]
Long-term Debt	$ 350,000	350,000
Debt maturity date	Feb. 27, 2023
Long term debt, face amount	$ 350,000
Senior Notes Due March 1, 2028 [Member]
Long-term debt [Abstract]
Long-term Debt	$ 500,000	0
Debt maturity date	Mar. 01, 2028
Long term debt, face amount	$ 500,000
Credit Line Due June 30, 2019 [Member]
Long-term debt [Abstract]
Long-term Debt	$ 0	$ 0
Credit facility, expiration date	Jun. 30, 2019
Long term debt, face amount	$ 10,000
Revolving Credit Facility [Member]
Long-term debt [Abstract]
Credit facility, expiration date	Jun. 26, 2022

X

- Definition

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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Date when the debt instrument is scheduled to be fully repaid, in CCYY-MM-DD format.

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

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Amount, after accumulated amortization, of debt discount (premium).

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