Note 15 — Supplementary Information

At December 31, 2011, accrued liabilities included $2.2 million of deferred mobilization fees, $8.1 million of accrued interest expense, $3.0 million of worker’s compensation liabilities and $26.8 million of accrued payroll and payroll taxes. Other long-term obligations included $3.6 million of workers’ compensation liabilities as of December 31, 2011.

At December 31, 2010, accrued liabilities included $2.8 million of deferred mobilization fees, $8.1 million of accrued interest expense, $2.8 million of worker’s compensation liabilities and $21.3 million of accrued payroll and payroll taxes. Other long-term obligations included $3.9 million of workers’ compensation liabilities as of December 31, 2010.