Debt

Our long-term debt and interest rates on that debt were as follows (dollars in thousands):



	September 30, 2014				December 31, 2013
	Amount		Interest Rate		Amount		Interest Rate
Revolving Credit Facility, due October 2018	$	—	—	%	$	—	—	%
Five-Year Term Loan, due October 2018	65,000		1.53		650,000		1.54
Seven-Year Term Loan, due October 2020	645,125		1.78		650,000		1.79
6.50% Senior Notes, net of discounts of $22 and $26 as of September 30, 2014 and December 31, 2013, respectively, due March 2018	149,978		6.50		149,974		6.50
3.90% Senior Notes, net of discounts of $275 and $302 as of September 30, 2014 and December 31, 2013, respectively, due June 2022	399,725		3.90		399,698		3.90
4.50% Senior Notes, net of discount of $1,714 and $1,827 as of September 30, 2014 and December 31, 2013, respectively, due November 2023	698,286		4.50		698,173		4.50
3.65% Senior Notes, net of discount of $1,130 as of September 30, 2014, due September 2024	398,870		3.65		—		—
Total	2,356,984		3.56		2,547,845		3.08
Less current portion	6,500		1.78		39,000		1.59
Total long-term debt	$	2,350,484	3.56	%	$	2,508,845	3.10	%

On September 5, 2014, we issued $400.0 million of 3.65% fixed-rate senior notes due September 15, 2024, through a registered public offering. We used the proceeds of this offering and other cash from operations to repay $589.9 million of debt during the nine months ended September 30, 2014. In connection with the $400.0 million debt issuance, we paid $3.2 million of deferred financing costs, which will be amortized to interest expense using the effective interest method over the term of the debt.

For the nine months ended September 30, 2014 and 2013, cash payments for interest were $50.0 million and $21.0 million, respectively.

Annual principal maturities for debt, excluding unamortized debt discount, as of September 30, 2014 were: $1.6 million for the remainder of 2014, $6.5 million for 2015, 2016, and 2017; $221.5 million for 2018; $6.5 million for 2019; and $2.1 billion for 2020 and thereafter.

Included in interest expense, net, are amortization of treasury lock settlements and amortization of financing costs. For both the three months ended September 30, 2014 and 2013, amortization of treasury lock settlements was $1.4 million, and for both the nine months ended September 30, 2014 and 2013, amortization of treasury lock settlements was $4.2 million. During the three months ended September 30, 2014 and 2013, amortization of financing costs was $2.0 million and $2.9 million, respectively, and during the nine months ended September 30, 2014 and 2013, amortization of financing costs was $2.9 million and $3.3 million, respectively. In connection with our debt repayments during the three months ended September 30, 2014, we expensed $1.5 million of deferred financing costs.

At September 30, 2014, we have $1,646.9 million of fixed-rate senior notes and $710.1 million of variable-rate term loans outstanding. At September 30, 2014, the fair value of our fixed-rate debt was estimated to be $1,713.1 million. The difference between the book value and fair value is due to the difference between the period-end market interest rate and the stated rate of our fixed-rate debt. We estimated the fair value of our fixed-rate debt using quoted market prices (Level 2 inputs) within the fair value hierarchy, which is further defined in Note 2, Summary of Significant Accounting Policies, of the Notes to Consolidated Financial Statements in "Part II, Item 8. Financial Statements and Supplementary Data" of our updated 2013 Financial Statements.