8. Long-Term Debt

Long-term debt consisted of the following (in thousands):

	March 31, 2015		December 31, 2014
Revolving credit facility due July 2016	$	354,000	$	375,500
Partnership’s revolving credit facility due May 2018	502,000		460,000
Partnership’s term loan facility due May 2018	150,000		150,000
Partnership’s 6% senior notes due April 2021 (presented net of the unamortized discount of $4.3 million and $4.5 million, respectively)	345,677		345,528
Partnership’s 6% senior notes due October 2022 (presented net of the unamortized discount of $5.1 million and $5.2 million, respectively)	344,904		344,767
7.25% senior notes due December 2018	350,000		350,000
Other, interest at various rates, collateralized by equipment and other assets	994		1,107
Long-term debt	$	2,047,575	$	2,026,902

Exterran Senior Secured Credit Facility

As of March 31, 2015, we had $354.0 million in outstanding borrowings and $91.3 million in outstanding letters of credit under our senior secured revolving credit facility (the “Credit Facility”). At March 31, 2015, taking into account guarantees through letters of credit, we had undrawn and available capacity of $454.7 million under the Credit Facility.

The Partnership Revolving Credit Facility and Term Loan

In February 2015, the Partnership amended its senior secured credit agreement (the “Partnership Credit Agreement”), which among other things, increased the borrowing capacity under its revolving credit facility by $250.0 million to $900.0 million. The Partnership Credit Agreement, which matures in May 2018, also includes a $150.0 million term loan facility. During the three months ended March 31, 2015, the Partnership incurred transaction costs of $1.3 million related to the amendment of the Partnership Credit Agreement. These costs were included in intangible and other assets, net, and are being amortized over the term of the facility.

As of March 31, 2015, the Partnership had undrawn capacity of $398.0 million under its revolving credit facility. The Partnership Credit Agreement limits the Partnership’s ratio of Total Debt (as defined in the Partnership Credit Agreement) to EBITDA (as defined in the Partnership Credit Agreement) to not greater than 5.25 to 1.0 (subject to a temporary increase to 5.5 to 1.0 following the occurrence of certain events specified in the Partnership Credit Agreement). Because the August 2014 MidCon Acquisition closed during the third quarter of 2014, the Partnership’s Total Debt to EBITDA ratio threshold was temporarily increased to 5.5 to 1.0 during the quarter ended September 30, 2014 and continued at that level through March 31, 2015. As a result of this limitation, $354.7 million of the $398.0 million of undrawn capacity under the Partnership’s revolving credit facility was available for additional borrowings as of March 31, 2015. If the maximum allowed ratio of Total Debt to EBITDA had been 5.25 to 1.0 at March 31, 2015, then $277.5 million of the $398.0 million of undrawn capacity under the Partnership’s revolving credit facility would have been available for additional borrowings as of March 31, 2015.