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Basis of Presentation (Tables) | 9 Months Ended
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Sep. 30, 2012
Basis of Presentation |
Reconciliation of basic earnings per share ("EPS") to diluted EPS |
|  | Three Months Ended |  | Nine Months Ended |
|  | September 30, |  | September 30, |
(in thousands, except per share amounts) |  | 2012 |  | 2011 |  | 2012 |  | 2011 |
Net income available to common stockholders |  | $ | 12,976 |  | $ | 19,380 |  | $ | 36,036 |  | $ | 45,951 |
Basic weighted average shares outstanding |  | 48,346 |  | 48,253 |  | 48,322 |  | 49,247 |
Dilutive effect of potential common stock equivalents — stock options |  | 44 |  | 35 |  | 63 |  | 49 |
Diluted weighted average shares outstanding |  | 48,390 |  | 48,288 |  | 48,385 |  | 49,296 |
Earnings per common share: |  |  |  |  |  |  |  |  |
Basic |  | $ | 0.27 |  | $ | 0.40 |  | $ | 0.75 |  | $ | 0.93 |
Diluted |  | 0.27 |  | 0.40 |  | 0.74 |  | 0.93 |
Potentially dilutive securities excluded from earnings per diluted share because their effect is anti-dilutive |  | 1,709 |  | 1,752 |  | 1,714 |  | 1,746 |
Stock option and restricted stock unit activity of the entity |
|  | Three Months Ended |  | Nine Months Ended |
|  | September 30, |  | September 30, |
(in thousands) |  | 2012 |  | 2011 |  | 2012 |  | 2011 |
Stock-based compensation expense recognized in operating expenses |  | $ | 1,966 |  | $ | 1,230 |  | $ | 7,086 |  | $ | 3,524 |
Tax benefit of stock-based compensation expense in provision for income taxes |  | 691 |  | 449 |  | 2,462 |  | 1,267 |
Stock-based compensation expense, net of tax |  | $ | 1,275 |  | $ | 781 |  | $ | 4,624 |  | $ | 2,257 |
Fair value of shares vested |  | $ | 2,043 |  | $ | 1,287 |  | $ | 7,048 |  | $ | 3,405 |
Proceeds to the Company from the exercise of stock-based compensation |  | $ | 201 |  | $ | — |  | $ | 2,184 |  | $ | 154 |
Tax effect from exercise of stock-based compensation, including shortfall tax benefits |  | $ | (4 | ) | $ | — |  | $ | (60 | ) | $ | (71 | )
|  | At September 30, |
|  | 2012 |  | 2011 |
Stock-based compensation cost capitalized in inventory |  | $ | 354 |  | $ | 166 |
Schedule of effective tax rates and income tax expense |
|  | Three Months Ended |  | Nine Months Ended |
(in thousands, except |  | September 30, |  | September 30, |
percentage amounts) |  | 2012 |  | 2011 |  | 2012 |  | 2011 |
Effective tax rate |  | 41.4 | % | 34.2 | % | 42.6 | % | 37.1 | %
Provision for income taxes |  | $ | 9,069 |  | $ | 10,052 |  | $ | 26,788 |  | $ | 27,069 |

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- Definition Tabular disclosure of the amount of total share-based compensation cost, including the amounts attributable to each share-based compensation plan and any related tax benefits. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure of the reconciliation of basic net earnings per share (or unit) to diluted earnings per share (or unit). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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- Definition Tabular disclosure of the reconciliation using percentage or dollar amounts of the reported amount of income tax expense attributable to continuing operations for the year to the amount of income tax expense that would result from applying domestic federal statutory tax rates to pretax income from continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32687-109319 + Details
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