Note 4. Long-Term Debt

Long-term debt consisted of the following:



(In thousands)	June 30, 2016		December 31, 2015
Senior notes	$	95,000	$	120,000
Revolving credit facility	123,332		12,317
Capitalized leases and other obligations	—		1,488
Total long-term debt and capital lease obligations	218,332		133,805
Less: Current maturities	—		(26,488		)
Total maturities due after one year	$	218,332	$	107,317

We have one outstanding unsecured senior note agreement with an amount outstanding of $95.0 million at June 30, 2016. At December 31, 2015, we had two outstanding unsecured senior note agreements with an aggregate amount outstanding of $120.0 million. The remaining unsecured senior note agreement calls for two scheduled principal payments of $50.0 million and $45.0 million on January 3, 2018 and January 3, 2021, respectively. Interest rates on the principal payments are fixed and range from 4.00% to 4.79%. The effective average interest rate on our outstanding senior note agreements were 4.37% and 4.68% at June 30, 2016 and December 31, 2015, respectively.

On December 15, 2015, we entered into an amended and restated credit agreement with Wells Fargo Bank, National Association ("Wells Fargo") serving as administrative agent for the lenders (the "2015 Credit Agreement"). The 2015 Credit Agreement provides for a five-year, $250.0 million senior unsecured revolving line of credit. We may also request an increase in the line of credit commitments up to an aggregate of $350.0 million, which may include Term Loan Commitments, in a minimum amount of $25.0 million. Of the $250.0 million line of credit commitments, up to $100.0 million may be used for letters of credit and $30.0 million may be used for borrowings under the Wells Fargo Sweep Plus Loan Program (the "Sweep Program"). We utilize the Sweep Program to manage our daily cash needs, as it automatically initiates borrowings to cover overnight cash requirements primarily for working capital needs.

At our option, borrowings under the 2015 Credit Agreement bear interest at either: (i) LIBOR plus an applicable margin (based on our ratio of debt-to-total capitalization) that ranges from 1.0% to 1.50%; or (ii) a Base Rate plus an applicable margin (based on our ratio of debt-to-total capitalization) that ranges from 0.0% to 0.5%. Loans under the Sweep Program bear interest at the LIBOR plus applicable margin rate. Letter of credit fees equal to the applicable margin for LIBOR and Base Rate loans are charged quarterly in arrears on the daily average aggregate stated amount of all letters of credit outstanding during the quarter. Commitment fees ranging from 0.125% to 0.2% (based upon the ratio of debt-to-total capitalization) are charged quarterly in arrears on the aggregate unutilized portion of the 2015 Credit Agreement. Wells Fargo, as administrative agent, also receives an annual fee for providing administrative services.

For the three and six months ended June 30, 2016 under the 2015 Credit Agreement, the applicable margin on LIBOR loans was 1.0% and commitment fees were 0.125%. For the three and six months ended June 30, 2015 under the previous credit agreement, the applicable margin on LIBOR loans was 1.0% and commitment fees were 0.175%. There were $74.9 million and $67.7 million of outstanding letters of credit at June 30, 2016 and December 31, 2015, respectively. Letter of credit fees remained at 1.0% during the three and six months ended June 30, 2016 and 2015.