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Accrued Expenses | 6 Months Ended
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Jun. 30, 2012
Accrued Expenses | 7. Accrued Expenses Accrued expenses consisted of the following at June 30, 2012 and December 31, 2011 (in thousands):
|  | June 30, 2012 |  |  | December 31, 2011 |
Salaries, wages, payroll taxes and benefits |  | $ | 49,198 |  |  | $ | 58,692 |
Workers’ compensation liability |  |  | 66,214 |  |  |  | 66,121 |
Property, sales, use and other taxes |  |  | 13,776 |  |  |  | 11,850 |
Insurance, other than workers’ compensation |  |  | 8,789 |  |  |  | 6,012 |
Accrued interest payable |  |  | 5,196 |  |  |  | 4,937 |
Deferred revenue - current |  |  | 5,137 |  |  |  | 7,229 |
2009 Performance Unit Awards |  |  | — |  |  |  | 3,640 |
Other |  |  | 5,072 |  |  |  | 6,148 |
|  | $ | 153,382 |  |  | $ | 164,629 |
Deferred revenue was recorded in the fourth quarter of 2010 in the purchase price allocation associated with the Company’s acquisition of a pressure pumping business. 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 $1.8 million and $3.6 million was recognized in the three and six months ended June 30, 2012, respectively, related to these pricing agreements. Deferred revenue of approximately $1.8 million and $4.7 million was recognized in the three and six months ended June 30, 2011, respectively, related to these pricing agreements.

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- Definition The entire disclosure for accounts payable and accrued liabilities at the end of the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19 -Subparagraph a -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(a),20,24) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 20, 24 -Article 5 + Details
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