Summary of Significant Accounting Policies (Tables)

12 Months Ended

Dec. 31, 2012

Summary of Significant Accounting Policies

Schedule of workers' compensation liabilities

Workers' compensation liabilities were as follows (in thousands):

	December 31,
	2012		2011
Undiscounted aggregated estimated claims to be paid	$	47,043	$	43,501
Workers' compensation liability recorded on a discounted basis	$	40,477	$	36,987