Long-term debt

Our long-term debt is summarized below (in thousands):



	Mar. 31, 2016			Dec. 31, 2015

Unsecured floating rate term loan due quarterly through August 2018	$	75,800		$	83,700
VIE unsecured floating rate term loans due quarterly through December 2018	1,777			1,938
Unsecured floating rate term loan due quarterly through June 2020	170,000			180,000
Borrowings under revolving credit agreement expiring June 2020	762,000			720,000
Unsecured notes bearing fixed rate interest at 10% due April 2016	193,429			193,429
Unsecured notes bearing fixed rate interest at 7.125% due September 2018	70,000			70,000
Unsecured notes bearing fixed rate interest at 5.125% due October 2019	600,000			600,000
Unsecured notes bearing fixed rate interest at 5.125% due July 2020	600,000			600,000
Unsecured notes bearing fixed rate interest at 4.875% due September 2021	350,000			350,000
Unsecured notes bearing fixed rate interest at 6.375% due October 2023	650,000			650,000
Unsecured notes bearing fixed rate interest at 5.50% due September 2024	325,000			325,000
Unsecured notes bearing fixed rate interest at 7.75% due June 2027	200,000			200,000
Unsecured notes bearing fixed rate interest at 7.25% due September 2027	240,000			240,000
Total principal long-term debt	4,238,006			4,214,067
Debt issuance costs	(30,513		)	(31,800		)
Other (fair market value adjustments and discounts)	(10,125		)	(12,605		)
Total long-term debt	4,197,368			4,169,662
Less current portion of long-term debt maturities of VIE loans	646			646
Long-term debt, net of current portion	$	4,196,722		$	4,169,016

For the first three months of 2016, our long-term debt increased by $27.7 million, primarily due to additional borrowing of $42.0 million from the revolving credit facility, and from amortization of debt issuance costs and debt discounts of $1.3 million and $2.5 million, respectively. These increases were partially offset by debt payments of $18.1 million during the first quarter of 2016.

On April 1, 2016 we made a debt repayment of approximately $203.1 million (comprised of principal and accrued interest) related to our unsecured notes bearing fixed rate interest of 10%. The payment was made using borrowings from our revolving credit facility. On April 30, 2016, we had unused borrowing capacity of $362.9 million under our revolving credit facility.