Consolidated debt at December 31, 2015 and March 31, 2016 was as follows (in thousands, except as otherwise noted):



	December 31, 2015			March 31, 2016			Weighted-Average Interest Rate for the Three Months Ended March 31, 2016 ⁽¹⁾
Commercial paper⁽²⁾	$	279,961		$	—		0.7%
$250.0 million of 5.65% Notes due 2016⁽³⁾	250,335			250,229			5.7%
$250.0 million of 6.40% Notes due 2018	255,215			254,698			5.5%
$550.0 million of 6.55% Notes due 2019	564,116			563,161			5.7%
$550.0 million of 4.25% Notes due 2021	555,362			555,121			4.0%
$250.0 million of 3.20% Notes due 2025	249,700			249,707			3.2%
$650.0 million of 5.00% Notes due 2026⁽²⁾	—			649,193			5.0%
$250.0 million of 6.40% Notes due 2037	249,036			249,042			6.4%
$250.0 million of 4.20% Notes due 2042	248,437			248,445			4.2%
$550.0 million of 5.15% Notes due 2043	556,218			556,192			5.1%
$250.0 million of 4.20% Notes due 2045	249,914			249,914			4.6%
Total debt, excluding unamortized debt issuance costs	3,458,294			3,825,702			4.6%
Unamortized debt issuance costs	(18,672		)	(23,441		)
Less: current portion of long-term debt	250,335			250,229
Total long-term debt	$	3,189,287		$	3,552,032


(1)	Weighted-average interest rate includes the amortization/accretion of discounts, premiums and gains/losses realized on historical cash flow and fair value hedges recognized as interest expense.


(2)	These borrowings were outstanding for only a portion of the three-month period ending March 31, 2016. The weighted-average interest rate for these borrowings was calculated based on the number of days the borrowings were outstanding during the noted period.


(3)	These borrowings will mature in October 2016 and are included with current debt on our consolidated balance sheets at December 31, 2015 and March 31, 2016.