Financial Highlights
Management's Discussion and Analysis of Financial Condition and Results of Operations
Operations
Results of Operations Liquidity and Capital Resources Market Risk Exposures
Critical Accounting Policies Recent Accounting Pronouncements
Forward-Looking Information
Management's Report on Internal Control Over Financial Reporting
Reports of Independent Registered Public Accounting Firm
Consolidated Financial Statements
Notes to Consolidated Financial Statements
Note 1 - Summary of Significant Accounting Policies
Note 2 - Segment Information
Note 3 - Earnings Per Share
Note 4 - Employee and Retiree Benefits
Note 5 - Income Taxes
Note 6 - Property and Equipment
Note 7 - Acquisitions
Note 8 - Goodwill and Other Intangible Assets
Note 9 - Other Assets
Note 10 - Accrued Liabilities
Note 11 - Other Liabilities
Note 12 - Long-Term Debt
Note 13 - Accounts Receivable
Note 14 - Operating Leases
Note 15 - Share-Based Compensation Plans
Note 16 - Capital Stock
Note 17 - Discontinued Operations
Note 18 - Supplemental Cash Flow Information
Note 19 - Other Operating Income, Net
Note 20 - Interest and Other Nonoperating Income (Expense), Net
Note 21 - Risk Management
Note 22 - Other Commitments and Contingencies
Note 23 - Selected Quarterly Financial Data (unaudited)
Selected Financial Data
Board of Directors and Senior Management
Corporate Information

Other Potential Use of Credit

Surety Bonds and Letters of Credit

The Company is required by various state and federal laws to provide security with regard to its obligations to pay workers' compensation, reclaim lands used for mining by the Company's former coal operations and satisfy other obligations. As of December 31, 2006, the Company had outstanding surety bonds with third parties totaling approximately $45.2 million that it has arranged in order to satisfy various security requirements. Most of these bonds provide financial security for obligations which have already been recorded as liabilities. Surety bonds are typically renewable on a yearly basis; however, there can be no assurance the bonds will be renewed or that premiums in the future will not increase.

If the remaining surety bonds are not renewed, the Company believes that it has adequate available borrowing capacity under its Letter of Credit Facility and its Revolving Facility to provide letters of credit or other collateral to secure its obligations.

The Company has issued letters of credit of $141.3 million under its $150 million Letter of Credit Facility, described in "Debt" above. At December 31, 2006, all of these issued letters of credit were used to secure the Company's obligations.