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Basis of Presentation (Tables) | 9 Months Ended
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Sep. 30, 2016
Organization, Consolidation and Presentation of Financial Statements [Abstract] |
Reconciliation of basic earnings per share ("EPS") to diluted EPS | The following is a reconciliation of basic earnings per common share to diluted earnings per share for the three months and nine months ended September 30, 2016 and 2015, respectively:
| Three Months Ended September 30, |  | Nine Months Ended September 30,
(in thousands, except per share amounts) | 2016 |  | 2015 |  | 2016 |  | 2015
Net income available to common stockholders | $ | 29,797 |  |  | $ | 21,595 |  |  | $ | 72,341 |  |  | $ | 53,156 |
Basic weighted-average shares outstanding | 48,119 |  |  | 48,998 |  |  | 48,231 |  |  | 49,157 |
Dilutive effect of potential common stock equivalents — stock options and restricted stock units | 233 |  |  | 241 |  |  | 198 |  |  | 220 |
Diluted weighted-average shares outstanding | 48,352 |  |  | 49,239 |  |  | 48,429 |  |  | 49,377 |
Earnings per common share: |  |  |  |  |  |  |  |  |  |  |
Basic | $ | 0.62 |  |  | $ | 0.44 |  |  | $ | 1.50 |  |  | $ | 1.08 |
Diluted | $ | 0.62 |  |  | $ | 0.44 |  |  | $ | 1.49 |  |  | $ | 1.08 |
Potentially dilutive securities excluded from earnings per diluted share because their effect is anti-dilutive | — |  |  | — |  |  | — |  |  | — |
Stock option and restricted stock unit activity of the entity | The following table represents the Company’s stock option and restricted stock unit activity for the three months and nine months ended September 30, 2016 and 2015, respectively:
| Three Months Ended September 30, |  | Nine Months Ended September 30,
(in thousands) | 2016 |  | 2015 |  | 2016 |  | 2015
Stock-based compensation expense recognized in operating expenses | $ | 3,141 |  |  | $ | 2,794 |  |  | $ | 8,995 |  |  | $ | 8,869 |
Less: Tax benefit of stock-based compensation expense in provision for income taxes | 1,112 |  |  | 1,005 |  |  | 3,262 |  |  | 3,144 |
Stock-based compensation expense, net of tax | $ | 2,029 |  |  | $ | 1,789 |  |  | $ | 5,733 |  |  | $ | 5,725 |
Fair value of shares vested | $ | 3,088 |  |  | $ | 2,749 |  |  | $ | 9,039 |  |  | $ | 8,744 |
Proceeds to the Company from the exercise of stock-based compensation | $ | 4,166 |  |  | $ | 1,443 |  |  | $ | 6,695 |  |  | $ | 7,019 |
Tax effect from the exercise of stock-based compensation, including shortfall tax benefits | $ | 121 |  |  | $ | (58 | ) |  | $ | 140 |  |  | $ | (244 | )
| At September 30,
(in thousands) | 2016 |  | 2015
Stock-based compensation cost capitalized in inventory | $ | 463 |  |  | $ | 464 |
Summary of financial instruments | The balances of the Company’s primary financial instruments at the dates indicated were as follows:
| At September 30, |  | At December 31,
(in thousands) | 2016 |  | 2015 |  | 2015
United States Treasury securities and money market funds | $ | 13,334 |  |  | $ | 76,488 |  |  | $ | 76,047 |
Schedule of effective tax rates and income tax expense | The following table presents the Company’s effective tax rates and income tax expense for the three months and nine months ended September 30, 2016 and 2015, respectively:
| Three Months Ended September 30, |  | Nine Months Ended September 30,
(in thousands, except percentages) | 2016 |  | 2015 |  | 2016 |  | 2015
Effective tax rate | 34.8 | % |  | 38.4 | % |  | 35.9 | % |  | 38.4 | %
Provision for income taxes | $ | 15,898 |  |  | $ | 13,479 |  |  | $ | 40,601 |  |  | $ | 33,115 |

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- Definition Tabular disclosure of assets measured at fair value measured on a recurring or nonrecurring basis. Includes, but is not limited to, fair value measurements recorded and the reasons for the measurements, level within the fair value hierarchy in which the fair value measurements are categorized and transfers between levels 1 and 2. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19190-110258 + Details
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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 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=65882285&loc=d3e32687-109319 + Details
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