Debt



		December 31,
	Interest rate	2018		2017
Notes due March 2018	5.60%	$	—	$	250,000
Notes due March 2019	6.25%	—		300,000
Notes due September 2020	3.875%	300,000		300,000
Notes due October 2021	3.875%	600,000		600,000
Notes due May 2022	4.375%	400,000		400,000
Notes due April 2023	4.95%	400,000		400,000
Notes due March 2024	4.625%	500,000		500,000
Notes due January 2037	5.25%	35,841		35,841
Notes due March 2043	6.70%	425,000		425,000
Term loans	Variable	630,000		650,000
Other debt		5,297		5,476
Principal amount		3,296,138		3,866,317
Less: unamortized costs, net		30,530		35,982
Total debt		3,265,608		3,830,335
Less: current portion long-term debt		199,535		271,057
Long-term debt		$	3,066,073	$	3,559,278

In 2018, Standard & Poor's lowered our corporate credit rating from BBB- to BB+ and as a result, the interest rate on certain notes and term loans increased 0.25%.

During 2018, we repaid the $250 million, 5.6% notes that matured in March 2018 and $20 million of principal on our term loans. We also redeemed the $300 million, 6.25% notes due March 2019 and recorded an $8 million loss on the early redemption. In 2017, we recorded a loss of $4 million on the early redemption of debt. Pursuant to an extension option, we extended the maturity of a $150 million term loan to August 2019.

Annual maturities of outstanding debt at December 31, 2018 are as follows:



2019	$	200,194
2020	730,103
2021	600,000
2022	400,000
2023	400,000
Thereafter	965,841
Total	$	3,296,138