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Quarterly Financial Data (Tables) | 12 Months Ended
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Dec. 31, 2012
Quarterly Financial Data [Abstract] |
Schedule of quarterly financial data |
| First Quarter |  | Second Quarter |  | Third Quarter |  | Fourth Quarter |  | Total
| (in thousands, except per share data)
2012 |  |  |  |  |  |  |  |  |
Revenue | $ | 79,195 |  |  | $ | 78,303 |  |  | $ | 78,628 |  |  | $ | 76,702 |  |  | $ | 312,828 |
Gross margin | 33,451 |  |  | 33,025 |  |  | 33,843 |  |  | 31,300 |  |  | 131,619 |
Net income | 3,606 |  |  | 13,178 |  |  | 9,806 |  |  | 23,201 |  |  | 49,791 |
Earnings per share (1): |  |  |  |  |  |  |  |  |
Basic | $ | 0.08 |  |  | $ | 0.27 |  |  | $ | 0.20 |  |  | $ | 0.48 |  |  | $ | 1.03 |
Diluted | $ | 0.07 |  |  | $ | 0.25 |  |  | $ | 0.19 |  |  | $ | 0.44 |  |  | $ | 0.97 |
2011 |  |  |  |  |  |  |  |  |
Revenue | $ | 52,905 |  |  | $ | 55,918 |  |  | $ | 75,058 |  |  | $ | 74,904 |  |  | $ | 258,785 |
Gross margin | 21,145 |  |  | 22,244 |  |  | 30,717 |  |  | 31,714 |  |  | 105,820 |
Net income | 10,374 |  |  | 2,126 |  |  | 17,917 |  |  | 991 |  |  | 31,408 |
Earnings per share (1): |  |  |  |  |  |  |  |  |
Basic | $ | 0.15 |  |  | $ | 0.05 |  |  | $ | 0.38 |  |  | $ | 0.02 |  |  | $ | 0.60 |
Diluted | $ | 0.13 |  |  | $ | 0.04 |  |  | $ | 0.35 |  |  | $ | 0.02 |  |  | $ | 0.56 |
(1) The sum of the quarterly earnings per share applicable to common stockholders (basic and diluted) may not agree to the earnings per share for the year due to the timing of common stock issuances.

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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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