Debt

Debt at December 31, 2012 and 2013 was as follows (in thousands):



					Weighted-Average Interest Rate at December 31, 2013 (a)
	December 31,
	2012		2013
Revolving credit facility	$	—	$	—	—%
$250.0 million of 6.45% Notes due 2014	249,905		249,971		6.3%
$250.0 million of 5.65% Notes due 2016	251,609		251,183		5.7%
$250.0 million of 6.40% Notes due 2018	261,411		259,346		5.4%
$550.0 million of 6.55% Notes due 2019	575,065		571,515		5.7%
$550.0 million of 4.25% Notes due 2021	558,088		557,213		4.0%
$250.0 million of 6.40% Notes due 2037	248,981		248,998		6.4%
$250.0 million of 4.20% Notes due 2042	248,349		248,377		4.2%
$300.0 million of 5.15% Notes due 2043	—		298,684		5.2%
Total debt	$	2,393,408	$	2,685,287	5.2%


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

The revolving credit facility and notes detailed in the table above are senior indebtedness.

The face value of our debt at December 31, 2012 and 2013 was $2.4 billion and $2.7 billion, respectively. The difference between the face value and carrying value of the debt outstanding is the unamortized portion of terminated fair value hedges and the unamortized discounts and premiums on debt issuances. Realized gains and losses on fair value hedges and note discounts and premiums are being amortized or accreted to the applicable notes over the respective lives of those notes. At December 31, 2013, maturities of our debt were as follows: $250.0 million in 2014; $0 in 2015; $250.0 million in 2016; $0 in 2017; $250.0 million in 2018; and $1.9 billion thereafter.

2013 Debt Offering

In October 2013, we issued $300.0 million of 5.15% notes due October 15, 2043 in an underwritten public offering. The notes were issued for the discounted price of 99.6% of par. We used the net proceeds from this offering of approximately $295.6 million, after underwriting discounts and offering expenses of $3.1 million, to repay borrowings outstanding under our revolving credit facility and for general partnership purposes, including expansion capital.

Other Debt

Revolving Credit Facility. During November 2013, we amended our revolving credit facility to increase the borrowing capacity from $800.0 million to $1.0 billion and extend the maturity date from October 2016 to November 2018. In connection with this amendment, we paid $1.7 million of debt placement fees and wrote off $0.2 million of unamortized debt placement fees associated with the original revolving credit facility. Borrowings under our revolving credit facility are unsecured and bear interest at LIBOR plus a spread ranging from 1.0% to 1.75% based on our credit ratings. At December 31, 2013, our borrowing rate under the facility was LIBOR plus 1.125%. Additionally, an unused commitment fee is assessed at a rate from 0.10% to 0.28%, depending on our credit ratings, which was 0.125% at December 31, 2013. Borrowings under this facility may be used for general purposes, including capital expenditures. As of December 31, 2013, there were no borrowings outstanding under this facility with $5.6 million obligated for letters of credit. Amounts obligated for letters of credit are not reflected as debt on our consolidated balance sheets, but decrease our borrowing capacity under the facility.

The revolving credit facility described above requires us to maintain a specified ratio of consolidated debt to EBITDA (as defined in the credit agreement) of no greater than 5.0 to 1.0. In addition, the revolving credit facility and the indentures under which our senior notes were issued contain covenants that limit our ability to, among other things, incur indebtedness secured by certain liens or encumber our assets, engage in certain sale-leaseback transactions and consolidate, merge or dispose of all or substantially all of our assets. We were in compliance with these covenants as of and during the year ended December 31, 2013.

During the years ending December 31, 2011, 2012 and 2013, total cash payments for interest on all indebtedness, excluding the impact of related interest rate swap agreements, were $111.7 million, $123.3 million and $134.6 million, respectively.