These imports will come at a cost in both our higher intensity carbon footprint and in price as the Baltic Dry Index is up 135% from a year ago and is at a 10-year high.
You can see in this quarter, we purchased approximately $185 million of Eagle stock.
As for Wallboard, pricing is most strongly driven by demand, and demand has been strong as evidenced by our 33% year-on-year increase in Wallboard prices.
We are currently hedged for approximately 50% of our natural gas needs through the remainder of our fiscal year at slightly under [$4 per million], which should help us manage our cost swings.
Outbound freight in Wallboard is also important, and we saw a 14% increase in freight costs this quarter.
Second quarter revenue was a record $510 million, an increase of 14% from the prior year.
Second quarter diluted earnings per share from continuing operations was $2.46, a 14% increase from the prior year.
And adjusting for our refinancing actions during the quarter, adjusted earnings per share was $2.73, a 26% improvement.
Revenue in the sector increased 5%, driven by the increase in cement sales prices and sales volume.
The price increases range from $6 to $8 per ton and were effective in most markets in early April.
Operating earnings increased 13%, reflecting higher cement prices and sales volumes as well as reduced maintenance costs.
Consistent with the comments we made in the first quarter, and because we shifted all of our planned cement maintenance outages to the first quarter, our second quarter maintenance costs were about $4 million less than what they were in the prior year.
Revenue in our Light Materials sector increased 28%, reflecting higher Wallboard sales volume prices.
Operating earnings in the sector increased 39% to $67 million, reflecting higher net sales prices, which helped offset higher input costs, mainly recycled fiber costs and energy.
During the first six months of the year, operating cash flow was $262 million, a 27% year-on-year decrease reflects the receipt of our IRS refund and other tax benefits in the prior year.
Capital spending declined to $27 million.
And as Michael mentioned, we restarted our share repurchase program and our quarterly cash dividend this year and returned $259 million to shareholders during the first half of the year.
We repurchased approximately 1.7 million shares or 4% of our outstanding.
At the end of the quarter, 5.6 million shares were available for repurchase under the current authorization.
During this quarter, we completed the refinancing of our capital structure, which included issuing $750 million of 10-year senior notes with an interest rate of 2.5%.

Summary:
Second quarter revenue was a record $510 million, an increase of 14% from the prior year.
Second quarter diluted earnings per share from continuing operations was $2.46, a 14% increase from the prior year.
And adjusting for our refinancing actions during the quarter, adjusted earnings per share was $2.73, a 26% improvement.