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Employee Compensation	6 Months Ended
Employee Compensation	Jun. 30, 2011
Employee Compensation [Abstract]
Employee Compensation	6. Employee Compensation Employee Incentive Compensation — Pursuant to our incentive compensation plans, we accrued $1.1 million and $1.3 million for the quarter and six months ended June 30, 2010, respectively. For the quarter and six months ended June 30, 2011, we did not accrue incentive compensation expense as certain thresholds were not met. We also have a Safety Incentive Plan related to Occupational Safety and Health Administration recordable incidents, for which we expensed $0.2 million and $0.3 million for the quarter and six months ended June 30, 2011, respectively. For the quarter and six months ended June 30, 2010, we expensed $0.1 million and $0.3 million, respectively.