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Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium.

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Long-Term Debt - Long Term Debt (Details) $ in Thousands, kr in Millions	Dec. 31, 2019 USD ($)	Dec. 31, 2019 DKK (kr)	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)
Debt Instrument
Unamortized debt issuance costs and original issue discount	$ (10,774)		$ (11,417)
Long-term debt	1,517,372		1,477,892
Current maturities of long-term debt	(65,846)		(54,930)
Long-term debt net of current maturities	1,451,526		1,422,962
Senior notes
Debt Instrument
Long-term debt, gross	$ 800,000		800,000
Senior notes \| Minimum
Debt Instrument
Effective interest rate, percent	4.63%	4.63%
Senior notes \| Maximum
Debt Instrument
Effective interest rate, percent	4.88%	4.88%
Term Loan \| Term Loan
Debt Instrument
Long-term debt, gross	$ 591,153		474,058
Unamortized debt issuance costs and original issue discount	$ (600)			$ (1,100)
Term Loan \| Term Loan \| Minimum
Debt Instrument
Effective interest rate, percent	1.30%	1.30%
Term Loan \| Term Loan \| Maximum
Debt Instrument
Effective interest rate, percent	3.94%	3.94%
Term Loan \| Finance leases and other financing arrangements
Debt Instrument
Long-term debt, gross	$ 108,613		98,914
Term Loan \| Finance leases and other financing arrangements \| Minimum
Debt Instrument
Effective interest rate, percent	1.90%	1.90%
Term Loan \| Finance leases and other financing arrangements \| Maximum
Debt Instrument
Effective interest rate, percent	6.00%	6.00%
Mortgage notes
Debt Instrument
Long-term debt, gross	$ 28,200	kr 187.8	30,375
Effective interest rate, percent	1.65%	1.65%
Line of Credit \| Revolving credit facilities
Debt Instrument
Long-term debt, gross	$ 0		85,000
Effective interest rate, percent	0.00%	0.00%
Installment notes for stock
Debt Instrument
Long-term debt, gross	$ 205		$ 962
Effective interest rate, percent	4.75%	4.75%