Debt

The following table summarizes the components of debt as of March 31, 2016 and December 31, 2015:



	March 31, 2016			December 31, 2015
	(in millions)
Corporate – Recourse:
Revolving credit facility	$	—		$	—
Senior notes, net of unamortized discount of $0.4 and $0.4	399.6			399.6
Convertible subordinated notes, net of unamortized discount of $39.6 and $43.8	409.8			405.6
Other	0.5			0.5
	809.9			805.7
Less: unamortized debt issuance costs	(4.4		)	(4.7		)
	805.5			801.0
Leasing – Recourse:
Capital lease obligations, net of unamortized debt issuances costs of $0.1 and $0.1	34.9			35.7
Total recourse debt	840.4			836.7

Leasing – Non-recourse:
Wholly-owned subsidiaries:
2006 secured railcar equipment notes	202.8			204.1
2009 secured railcar equipment notes	177.4			179.2
2010 secured railcar equipment notes	292.1			296.2
TILC warehouse facility	259.3			264.3
	931.6			943.8
Less: unamortized debt issuance costs	(14.1		)	(15.1		)
	917.5			928.7
Partially-owned subsidiaries:
TRL 2012 secured railcar equipment notes (RIV 2013)	443.6			449.1
TRIP Master Funding secured railcar equipment notes (TRIP Holdings)	985.9			997.8
	1,429.5			1,446.9
Less: unamortized debt issuance costs	(16.4		)	(16.9		)
	1,413.1			1,430.0
Total non–recourse debt	2,330.6			2,358.7
Total debt	$	3,171.0		$	3,195.4

We have a $600.0 million unsecured corporate revolving credit facility that matures in May 2020. As of March 31, 2016, we had letters of credit issued under our revolving credit facility in an aggregate principal amount of $93.4 million, leaving $506.6 million available for borrowing. Other than these letters of credit, there were no borrowings under our revolving credit facility as of March 31, 2016, or for the three month period then ended. Of the outstanding letters of credit as of March 31, 2016, approximately $92.1 million is expected to expire in 2016 and the remainder in 2017. The majority of our letters of credit obligations support the Company’s various insurance programs and generally renew each year. Trinity’s revolving credit facility requires the maintenance of ratios related to minimum interest coverage for the leasing and manufacturing operations and maximum leverage. As of March 31, 2016, we were in compliance with all such financial covenants. Borrowings under the credit facility bear interest at a defined index rate plus a margin and are guaranteed by certain 100%-owned subsidiaries of the Company.

The Company's 3 7/8% Convertible Subordinated Notes are recorded net of unamortized discount to reflect their underlying economics by capturing the value of the conversion option as borrowing costs. As of March 31, 2016 and December 31, 2015, capital in excess of par value included $92.5 million related to the estimated value of the Convertible Subordinated Notes’ conversion options, in accordance with ASC 470-20. Debt discount recorded in the consolidated balance sheet is being amortized through June 1, 2018 to yield an effective annual interest rate of 8.42% based upon the estimated market interest rate for comparable non-convertible debt as of the issuance date of the Convertible Subordinated Notes. Total interest expense recognized on the Convertible Subordinated Notes for the three months ended March 31, 2016 and 2015 is as follows:



	Three Months Ended March 31,
	2016		2015
	(in millions)
Coupon rate interest	$	4.4	$	4.4
Amortized debt discount	4.2		3.8
	$	8.6	$	8.2

Holders of the Convertible Subordinated Notes may convert their notes under the following circumstances: 1) if the daily closing price of our common stock is greater than or equal to 130% of the conversion price during 20 of the last 30 trading days of the preceding calendar quarter; 2) upon notice of redemption; or 3) upon the occurrence of specified corporate transactions pursuant to the terms of the applicable indenture. Upon conversion, the Company is required to pay cash up to the aggregate principal amount of the Convertible Subordinated Notes to be converted. Any conversion obligation in excess of the aggregate principal amount of the Convertible Subordinated Notes to be converted may be settled in cash, shares of the Company’s common stock, or a combination of cash and shares of the Company’s common stock, at the Company’s election. The conversion price, which is subject to adjustment upon the occurrence of certain events, was $24.86 per share as of March 31, 2016. The Convertible Subordinated Notes were not subject to conversion as of April 1, 2016. See Note 17 Earnings Per Common Share for an explanation of the effects of the Convertible Subordinated Notes on earnings per share. The Company has not entered into any derivatives transactions associated with these notes.

The $1.0 billion TILC warehouse loan facility, established to finance railcars owned by TILC, had $259.3 million in outstanding borrowings as of March 31, 2016. Under the facility, $740.7 million was unused and available as of March 31, 2016 based on the amount of warehouse-eligible, unpledged equipment. The warehouse loan facility is a non-recourse obligation secured by a portfolio of railcars and operating leases, certain cash reserves, and other assets acquired and owned by the warehouse loan facility trust. The principal and interest of this indebtedness are paid from the cash flows of the underlying leases. Advances under the facility bear interest at a defined index rate plus a margin, for an all-in interest rate of 2.31% at March 31, 2016. The warehouse loan facility has been renewed and extended through April 2018. Interest rate pricing remained unchanged under the renewed facility. Amounts outstanding at maturity, absent renewal, are payable under the renewed facility in April 2019.

Terms and conditions of other debt, including recourse and non-recourse provisions, are described in Note 11 of the December 31, 2015 Consolidated Financial Statements filed on Form 10-K. The remaining principal payments under existing debt agreements as of March 31, 2016 are as follows:



	Remaining nine months of 2016		2017		2018		2019		2020		Thereafter
	(in millions)
Recourse:
Corporate	$	0.2	$	0.3	$	—	$	—	$	—	$	849.4
Leasing – capital lease obligations (Note 6)	2.6		3.7		28.7		—		—		—
Non-recourse – leasing (Note 6):
2006 secured railcar equipment notes	20.6		23.9		25.3		28.0		29.8		75.2
2009 secured railcar equipment notes	4.9		6.3		6.4		11.2		6.6		142.0
2010 secured railcar equipment notes	11.2		13.7		10.0		7.6		14.2		235.4
TILC warehouse facility	6.6		8.8		8.8		2.2		—		—
TRL 2012 secured railcar equipment notes (RIV 2013)	16.9		22.9		23.1		22.2		19.5		339.0
TRIP Master Funding secured railcar equipment notes (TRIP Holdings)	27.9		29.2		41.8		50.1		49.6		787.3
Facility termination payments - TILC warehouse facility	—		—		—		232.9		—		—
Total principal payments	$	90.9	$	108.8	$	144.1	$	354.2	$	119.7	$	2,428.3