Debt

Total debt at March 31, 2017 and December 31, 2016 consisted of the following:



	Interest rate	March 31, 2017		December 31, 2016
Notes due September 2017	5.75%	$	385,109	$	385,109
Notes due March 2018	5.6%	250,000		250,000
Notes due May 2018	4.75%	350,000		350,000
Notes due March 2019	6.25%	300,000		300,000
Notes due October 2021	3.375%	600,000		600,000
Notes due March 2024	4.625%	500,000		500,000
Notes due January 2037	5.25%	35,841		115,041
Notes due March 2043	6.7%	425,000		425,000
Term loans	Variable	450,000		450,000
Other debt		5,584		5,677
Principal amount		3,301,534		3,380,827
Less: unamortized debt discount and issuance costs		27,600		28,796
Plus: unamortized interest rate swap proceeds		10,378		12,859
Total debt		3,284,312		3,364,890
Less: current portion long-term debt		785,287		614,485
Long-term debt		$	2,499,025	$	2,750,405

In January 2017, bondholders of the 5.25% Notes due 2037 caused us to redeem $79 million of the debt outstanding.