Debt

6 Months Ended

Jun. 30, 2019

Total debt at June 30, 2019 and December 31, 2018 consisted of the following:



	Interest rate	June 30, 2019		December 31, 2018
Notes due September 2020	3.875%	$	300,000	$	300,000
Notes due October 2021	3.875%	600,000		600,000
Notes due May 2022	4.625%	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	6.7%	425,000		425,000
Term loans	Variable	605,000		630,000
Other debt		5,210		5,297
Principal amount		3,271,051		3,296,138
Less: unamortized costs, net		26,878		30,530
Total debt		3,244,173		3,265,608
Less: current portion long-term debt		214,927		199,535
Long-term debt		$	3,029,246	$	3,066,073

Interest rates on certain notes are subject to adjustment based on changes in our credit ratings. In April 2019, Moody's lowered our corporate credit rating from Ba1 to Ba2. As a result, the interest rate on the May 2022 notes increased 0.25% in the quarter and the interest rates on the September 2020 notes, October 2021 notes and April 2023 notes will increase 0.25% effective after the next interest payment date.

During the first half of 2019, we repaid $25 million of principal related to our term loans.