Employee Benefit Plans

12 Months Ended

Dec. 31, 2012

Employee Benefit Plans [Abstract]

EMPLOYEE BENEFIT PLANS

(10) EMPLOYEE BENEFIT PLANS

Deferred Compensation Plan

The Company maintains an Officer Deferred Compensation Plan that permits key officers to defer a portion of their compensation. The plan is nonqualified and funded. The Company has established a separate account for each participant, which is invested and reinvested from time to time in investments that the participant selects from a list of eligible investment choices. Earnings and losses on the book reserve accounts accrue to the plan participants. Liabilities for the plan are included in other long-term liabilities, and the corresponding investment accounts are included in other assets. Aggregate amounts deferred under the plans were $2.9 million and $2.8 million for the years ended December 31, 2012 and 2011 respectively.

Incentive Compensation

The Company has an incentive compensation plan for non-executive employees. The plan allows the Company to pay up to 8.25% of earnings before tax upon achieving a specified earnings threshold. The Company also has an executive/senior management plan for certain corporate and business unit management employees. Under this plan, the bonus is a percentage of each participating employee’s base salary based upon the Company’s achievement of the financial target established by the Board of Directors at three levels – a threshold level, a target level, and a stretch level, subject to a positive or negative adjustment for the Company’s safety performance. Pursuant to these plans, the Company accrued incentive compensation expense of $6.0 million, $2.6 million, and $1.6 million for the years ended December 31, 2012, 2011, and 2010, respectively. We also have a Safety Incentive Plan related to Occupational Safety and Health Administration recordable incidents, for which we expensed and paid $0.7 million, $0.6 million, and $0.6 million for the years 2012, 2011, and 2010, respectively.

401(k) Plan

We sponsor a 401(k) Plan (“Plan”) for our employees. An employee is eligible to participate in the Plan immediately upon employment and receive a dollar matching contribution up to 6% of his or her base compensation. The vesting for matching contributions is 25% per year beginning at the end of the second year of employment. Employees are fully vested after completing 5 years of service to the Company. The matching contribution for the years ended December 31, 2012, 2011, and 2010 were $9.0 million, $8.4 million, and $8.1 million, respectively.