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VALUATION AND QUALIFYING ACCOUNTS | 12 Months Ended
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Dec. 31, 2011
VALUATION AND QUALIFYING ACCOUNTS | PATTERSON-UTI ENERGY, INC. AND SUBSIDIARIES SCHEDULE II — VALUATION AND QUALIFYING ACCOUNTS
Description |  | Beginning Balance |  |  | Charged to Costs and Expenses |  |  | Deductions(1) |  |  | Ending Balance |
|  | (In thousands) |
Year Ended December 31, 2011 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Deducted from asset accounts: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Allowance for doubtful accounts |  | $ | 5,114 |  |  | $ | 0 |  |  | $ | 227 |  |  | $ | 4,887 |
Year Ended December 31, 2010 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Deducted from asset accounts: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Allowance for doubtful accounts |  | $ | 10,911 |  |  | $ | (2,000 | ) |  | $ | 3,797 |  |  | $ | 5,114 |
Year Ended December 31, 2009 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Deducted from asset accounts: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Allowance for doubtful accounts |  | $ | 9,330 |  |  | $ | 4,700 |  |  | $ | 3,119 |  |  | $ | 10,911 |
(1) | Consists of uncollectible accounts written off.

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- Definition The entire disclosure for any allowance and reserve accounts (their beginning and ending balances, as well as a reconciliation by type of activity during the period). Alternatively, disclosure of the required information may be within the footnotes to the financial statements or a supplemental schedule to the financial statements. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 09 -Article 12 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6881521&loc=d3e24092-122690 + Details
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Namespace Prefix: | us-gaap_
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Period Type: | duration