David W. Grzebinski
Analyst · RBC Capital Markets
All right. Thank you, Joe, and good morning. I'll hit some key points in the quarter, turn it over to Andy for some detail, and then come back for an outlook.
In the Marine Transportation segment, our inland marine barge demand remains in the 90% to 95% range. Long-term, inland marine transportation contracts, those contracts with a term of one year or longer in duration, contributed about 80% of revenue for the 2015 third quarter, with 55% attributable to time charters and 45% contracts of affreightment.
Pricing on the inland marine transportation term contracts that renewed during the third quarter was down in the low to mid-single-digits. Our spot contract rates remained at or above term rates. However, the spot market is dynamic. So we see, on occasion, our competition offering equipment below our term rates. Unique to Kirby, most of our spot opportunities are with existing term customers.
In our coastal marine transportation sector, demand for the coastwise transportation of refined products, black oil and petrochemicals remained consistent with the first half of the year. However, we have seen some increase in our spot exposure, which we attribute to increased uncertainty in the market by our customers, driven by uncertainty around crude oil supplies.
During the third quarter, approximately 80% of coastal revenues were under term contracts. Kirby's coastal equipment utilization remained in the 90% to 95% range.
With respect to coastal marine transportation pricing, term contracts that renewed during the quarter increased in the low to mid-single-digit percent range.
In our Diesel Engine Services segment, our marine diesel and power generation markets experienced stable demand in most regions of the country except for the Gulf of Mexico oil service business where services for supply vessels and offshore rigs declined.
Our land-based diesel engine services market remains challenging. Demand for service parts and distribution has remained relatively consistent with levels experienced in the 2015 second quarter, but there remains little demand for new manufacturing of pressure pumping equipment. We will continue to aggressively address costs in this business.
During the 2015 third quarter, we continued to execute on our share repurchase authorization, buying approximately 892,000 shares for $63 million or an average share price of $70.97. Subsequent to the end of the quarter through this past Tuesday, we repurchased approximately an additional 292,000 shares at an average price of $64.62. October's purchases brought total repurchases for the year to over 2.9 million shares or approximately 5% of shares outstanding. Currently, our unused repurchase authorization is 1.8 million shares.
I'll now turn the call over to Andy to provide some detailed financial information. And again, I'll come back and discuss the outlook.