Deposits	12 Months Ended
Dec. 31, 2012
Deposits [Abstract]
Deposits	4. Deposits The contractual arrangement with United for health insurance coverage requires us to maintain an accumulated cash surplus in the plan of $9.0 million, which is reported as long-term prepaid health insurance. Please read Note 1, "Accounting Policies," for a discussion of our accounting policies for health insurance costs. As of December 31, 2012, we had $64.2 million in workers' compensation long-term deposits. Please read Note 1 "Accounting Policies" for a discussion of our accounting policies for workers' compensation costs.

Deposits

12 Months Ended

Dec. 31, 2012

4. Deposits

The contractual arrangement with United for health insurance coverage requires us to maintain an accumulated cash surplus in the plan of $9.0 million, which is reported as long-term prepaid health insurance. Please read Note 1, "Accounting Policies," for a discussion of our accounting policies for health insurance costs.

As of December 31, 2012, we had $64.2 million in workers' compensation long-term deposits. Please read Note 1 "Accounting Policies" for a discussion of our accounting policies for workers' compensation costs.