Accrued Expenses

12 Months Ended

Dec. 31, 2011

6.	Accrued Expenses

Accrued expenses consisted of the following at December 31, 2011 and 2010 (in thousands):


	2011		2010
Salaries, wages, payroll taxes and benefits	$	58,692	$	39,866
Workers’ compensation liability		66,121		63,011
Property, sales, use and other taxes		11,850		6,682
Insurance, other than workers’ compensation		6,012		12,648
Accrued interest payable		4,937		4,879
Deferred revenue — current		7,229		10,220
2009 Performance Unit Awards		3,640		—
Other		6,148		10,009

	$	164,629	$	147,315

Deferred revenue was recorded in 2010 in the purchase price allocation associated with the Company’s acquisition of a pressure pumping business as discussed in Note 3. The deferred revenue relates to out-of-market pricing agreements that were in place at the acquired business at the time of the acquisition. The deferred revenue will be recognized as pressure pumping revenue over the remaining term of the pricing agreements. Deferred revenue of approximately $8.4 million and $6.1 million was recognized in the years ended December 31, 2011 and 2010, respectively, related to these pricing agreements.