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Selected Quarterly Financial Data (Tables) | 12 Months Ended
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Dec. 31, 2012
Schedule of Selected Quarterly Financial Data |
Fiscal Quarters Year Ended December 31, 2012 |  | First |  |  | Second |  |  | Third |  |  | Fourth |
Revenues, net |  | $ | 146,165 |  |  | $ | 171,820 |  |  | $ | 186,932 |  |  | $ | 202,617 |
Operating income |  |  | 64,475 |  |  |  | 81,448 |  |  |  | 85,834 |  |  |  | 93,171 |
Net income |  |  | 42,079 |  |  |  | 54,401 |  |  |  | 59,648 |  |  |  | 60,071 |
Earnings per share: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basic earnings per share |  | $ | 0.51 |  |  | $ | 0.65 |  |  | $ | 0.71 |  |  | $ | 0.72 |
Diluted earnings per share |  |  | 0.49 |  |  |  | 0.63 |  |  |  | 0.69 |  |  |  | 0.70 |
Weighted average shares outstanding: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basic weighted average shares outstanding |  |  | 82,565 |  |  |  | 83,294 |  |  |  | 84,002 |  |  |  | 83,378 |
Diluted weighted average shares outstanding |  |  | 85,164 |  |  |  | 85,737 |  |  |  | 86,224 |  |  |  | 85,750 |
Fiscal Quarters Year Ended December 31, 2011 |  | First |  |  | Second |  |  | Third |  |  | Fourth |
Revenues, net |  | $ | 111,005 |  |  | $ | 134,213 |  |  | $ | 134,213 |  |  | $ | 140,160 |
Operating income |  |  | 50,487 |  |  |  | 59,892 |  |  |  | 61,723 |  |  |  | 54,232 |
Net income |  |  | 32,335 |  |  |  | 36,715 |  |  |  | 40,514 |  |  |  | 37,771 |
Earnings per share: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basic earnings per share |  | $ | 0.40 |  |  | $ | 0.46 |  |  | $ | 0.50 |  |  | $ | 0.46 |
Diluted earnings per share |  |  | 0.39 |  |  |  | 0.44 |  |  |  | 0.48 |  |  |  | 0.45 |
Weighted average shares outstanding: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basic weighted average shares outstanding |  |  | 79,937 |  |  |  | 80,151 |  |  |  | 80,819 |  |  |  | 81,512 |
Diluted weighted average shares outstanding |  |  | 83,378 |  |  |  | 83,548 |  |  |  | 83,649 |  |  |  | 84,035 |

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- Definition Tabular disclosure of the quarterly financial data in the annual financial statements. The disclosure includes financial information for each fiscal quarter for the current and previous year, including revenues, gross profit, income (loss) before extraordinary items and cumulative effect of a change in accounting principle and earnings per share data. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 270 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a)-(j) -URI http://asc.fasb.org/extlink&oid=20225539&loc=d3e1280-108306 + Details
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Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration