NOTE 13. DEBT

The following table presents information about the Company’s total indebtedness at September 30, 2018 and December 31, 2017 (in thousands):



	September 30, 2018						December 31, 2017
	Effective Interest Rate		Principal Amount		Carrying Amount		Effective Interest Rate		Principal Amount		Carrying Amount
7.25% Senior Notes due 2022	7.91	%	$	400,000	$	392,439	7.91	%	$	400,000	$	390,974
5.75% Senior Notes due 2022	6.04	%	700,000		694,053		6.04	%	700,000		692,855
5.375% Senior Notes due 2023	5.62	%	750,000		743,083		5.62	%	750,000		742,048
6.00% Senior Notes due 2023	6.28	%	1,635,000		1,615,955		6.28	%	1,635,000		1,613,446
5.875% Senior Secured Notes due 2024	6.14	%	300,000		295,922		6.14	%	300,000		295,513
6.00% Senior Notes due 2025	6.27	%	1,200,000		1,182,859		6.27	%	1,200,000		1,181,243
Term Loan B Facility Due 2024	5.46	%	3,372,313		3,338,451		5.46	%	3,397,925		3,360,103
Other debt			—		—		1.50	%	55		55
Total long-term debt, net			$	8,357,313	$	8,262,762			$	8,382,980	$	8,276,237
Less current portion, net			34,150		34,150				34,205		34,205
Total long-term debt, less current portion, net			$	8,323,163	$	8,228,612			$	8,348,775	$	8,242,032

The senior unsecured notes are unsecured and effectively subordinated in right of priority to our credit agreement (the 2017 Credit Agreement) and our senior secured notes, in each case to the extent of the value of the collateral securing such instruments, which collateral represents substantially all of the assets of the issuers or borrowers and the guarantors party thereto.

The aggregate estimated fair value of the Company’s long-term debt, which was estimated using inputs based on quoted market prices for the same or similar debt issuances, was $7.9 billion and $7.5 billion at September 30, 2018 and December 31, 2017, respectively. Based on this valuation methodology, we determined these debt instruments represent Level 2 measurements within the fair value hierarchy.

Credit Facility

We have $997.2 million of remaining credit available through our revolving credit facility as of September 30, 2018. As of September 30, 2018, we were in compliance with all covenants contained in our credit agreement.