The following table summarizes the aggregate workers’ compensation reserve activity (in thousands):


	Three Months Ended September 30,				Nine Months Ended September 30,
	2013		2012		2013		2012
Beginning balance
Workers’ compensation claims liabilities	$	84,543	$	55,765	$	70,564	$	51,193
Add: claims expense accrual:
Current period		17,396		9,891		44,825		26,224
Prior periods		5,002		3,835		12,688		6,945

Total expense accrual		22,398		13,726		57,513		33,169

Less: claim payments related to:
Current period		3,124		2,207		5,998		3,790
Prior periods		7,837		5,656		26,099		18,944

Total paid		10,961		7,863		32,097		22,734

Ending balance
Workers’ compensation claims liabilities	$	95,980	$	61,628	$	95,980	$	61,628

Incurred but not reported (IBNR)	$	59,412	$	44,311	$	59,412	$	44,311