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Employee Benefits	12 Months Ended
Employee Benefits	Dec. 31, 2011
Employee Benefits [Abstract]
Employee Benefits	Employee Benefits All employees except the Associate Divers, the Associate Tugmasters, and union employees in the Pacific Northwest, are eligible to participate in the Company’s 401(k) Retirement Plan after completing six months of service. Each participant may contribute between 1% and 80% of eligible compensation on a pretax basis, up to the annual IRS limit. The Company matches 100% on the first 2% of eligible compensation contributed to the Plan and 50% on the next 2% of eligible compensation contributed to the Plan. Participants’ contributions are fully vested at all times. Employer matching contributions vest over a four-year period. At its discretion, the Company may make additional matching and profit-sharing contributions. During the years ended December 31, 2011, 2010 and 2009, the Company contributed $1.1 million, $1.1 million, and $1.0 million to the plan in each respective year.