DEBT

The following is a summary of the Company’s debt (in thousands):



	December 31,
	2016			2015
9½% Senior Notes	$	250,000		$	250,000
Credit Facility	—			—
	$	250,000		$	250,000
Less: unamortized debt issuance costs	(3,143		)	(4,304		)
	$	246,857		$	245,696

9½% Senior Unsecured Notes: On March 20, 2013, the Company issued, in a private placement, $250.0 million aggregate principal amount of 9½% senior notes due 2019 (the “9½% Senior Notes”). The proceeds from the issuance of the 9½% Senior Notes, together with $29.8 million cash on hand, were used to satisfy and discharge the 9.75% senior notes due 2014 (the “9.75% Senior Notes”), including accrued interest of $4.8 million. As required by their terms, the 9½% Senior Notes were exchanged for senior notes of like amounts and terms in a publicly registered exchange offer in August 2013. The 9½% Senior Notes mature on April 15, 2019. Interest is payable in cash, semi-annually on April 15 and October 15 of each year. On both December 31, 2016 and 2015, accrued interest totaled $5.0 million and was included in accrued liabilities on the consolidated balance sheet. The 9½% Senior Notes are unsecured and are jointly and severally guaranteed by substantially all of the Company's significant domestic subsidiaries on a senior basis. The 9½% Senior Notes contain restrictive covenants which limit the Company's ability to, among other things, incur additional indebtedness, incur liens, pay dividends and make other restricted payments, engage in transactions with affiliates, and complete mergers, acquisitions and sales of assets.

Upon a change of control (as defined in the indenture), each holder of the 9½% Senior Notes will have the right to require the Company to offer to purchase all of such holder’s notes at a price equal to 101% of the principal amount, plus accrued and unpaid interest.

Credit Facility: On May 25, 2011, the Company entered into a credit agreement (the “Credit Facility”) with Wells Fargo Capital Finance, LLC and Wells Fargo Capital Finance Corporation Canada. The Credit Facility provided a $30.0 million revolving credit facility with a Canadian sublimit of $5.0 million (Canadian), subject to borrowing base limitations based on the Company’s seismic data assets and eligible accounts receivable, each as defined in the Credit Facility, calculated on a monthly basis. The Credit Facility expired on its own terms in May 2016 and the Company decided not to extend or renew the Credit Facility. No amounts were outstanding at the maturity date.

Aggregate Maturities: The aggregate maturities of the Company's debt are $250.0 million in 2019.