At March 31, 2016 and December 31, 2015, total debt consisted of the following:



	Interest rate	March 31, 2016		December 31, 2015
Commercial paper	1.13%	$	269,550	$	90,000
Notes due January 2016	4.75%	—		370,914
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 March 2024	4.625%	500,000		500,000
Notes due January 2037	5.25%	115,041		115,041
Notes due March 2043	6.7%	425,000		425,000
Term loans	Variable	450,000		150,000
Other debt		5,770		15,758
Principal amount		3,050,470		2,951,822
Less: unamortized discount and debt issuance costs		25,630		23,617
Plus: unamortized interest rate swap proceeds		20,105		22,463
Total debt		3,044,945		2,950,668
Less: current portion long-term debt and notes payable		269,732		461,085
Long-term debt		$	2,775,213	$	2,489,583