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Retirement Plan
12 Months Ended
Dec. 31, 2012
Retirement Plan  
Retirement Plan

Note 11. Retirement Plan

        We maintain a defined contribution pension plan covering full-time shoreside employees who have completed the minimum period of continuous service. Annual contributions to the plan are discretionary and are based on fixed percentages of participants' salaries and years of service, not to exceed certain maximums. Pension expenses were $15.2 million, $15.3 million and $13.3 million for the years ended December 31, 2012, 2011 and 2010, respectively.