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SCHEDULE II - VALUATION AND QUALIFYING ACCOUNTS | 12 Months Ended
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Dec. 31, 2011
SCHEDULE II - VALUATION AND QUALIFYING ACCOUNTS | SCHEDULE II — VALUATION AND QUALIFYING ACCOUNTS
| For the years ended December 31, 2011, 2010 and 2009
(in thousands) |  | Balance at Beginning of Period |  |  | Charged to Costs and Expenses |  |  | Net (Deductions) Recoveries |  |  | Balance at End of Period |
Year ended December 31, 2011 |  |  |  |  |  |  |  |  |  |  |  |
Allowance for doubtful accounts |  | $ | 8,694 |  |  | $ | 2,868 |  |  | $ | (3,469 | ) | (1) |  |  | $ | 8,093 |
Deferred tax asset valuation allowance |  | $ | 1,295 |  |  | $ | — |  |  | $ | — |  |  |  |  | $ | 1,295 |
Year ended December 31, 2010 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Allowance for doubtful accounts |  | $ | 3,210 |  |  | $ | 4,812 |  |  | $ | 672 |  | (1) |  |  | $ | 8,694 |
Deferred tax asset valuation allowance |  | $ | 1,550 |  |  | $ | — |  |  | $ | (255 | ) | (2) |  |  | $ | 1,295 |
Year ended December 31, 2009 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Allowance for doubtful accounts |  | $ | 6,199 |  |  | $ | 660 |  |  | $ | (3,649 | ) | (1) |  |  | $ | 3,210 |
Deferred tax asset valuation allowance |  | $ | 1,454 |  |  | $ | 96 |  |  | $ | — |  | (2) |  |  | $ | 1,550 |
(1) | Net (deductions) recoveries in the allowance for doubtful accounts principally reflect the write-off of previously reserved accounts net of recoveries.
(2) | The valuation allowance for deferred tax assets is increased or decreased each year to reflect the state net operating losses that management believes will not be utilized before they expire.
SELECTED QUARTERLY FINANCIAL DATA (UNAUDITED)
Quarters ended |  | March 31 |  |  | June 30 |  |  | September 30 |  |  | December 31 |
(in thousands except per share data) |  |  |  |  |  |  |  |  |  |  |  |
2011 |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  | $ | 381,761 |  |  | $ | 443,029 |  |  | $ | 502,235 |  |  | $ | 482,782 |
Net income |  | $ | 65,524 |  |  | $ | 73,165 |  |  | $ | 83,111 |  |  | $ | 74,581 |
Net income per share — basic (a) |  | $ | 0.45 |  |  | $ | 0.50 |  |  | $ | 0.57 |  |  | $ | 0.51 |
Net income per share — diluted (a) |  | $ | 0.45 |  |  | $ | 0.50 |  |  | $ | 0.57 |  |  | $ | 0.51 |
2010 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  | $ | 213,144 |  |  | $ | 252,896 |  |  | $ | 302,200 |  |  | $ | 328,144 |
Net income |  | $ | 13,400 |  |  | $ | 31,602 |  |  | $ | 46,269 |  |  | $ | 55,471 |
Net income per share — basic (a) |  | $ | 0.09 |  |  | $ | 0.22 |  |  | $ | 0.32 |  |  | $ | 0.38 |
Net income per share — diluted (a) |  | $ | 0.09 |  |  | $ | 0.21 |  |  | $ | 0.31 |  |  | $ | 0.38 |
(a) | The sum of the income (loss) per share for the four quarters may differ from annual amounts due to the required method of computing the weighted average shares for the respective periods.

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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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Period Type: | duration