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Earnings per share (Tables) | 12 Months Ended
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Dec. 31, 2017
Earnings per share [Abstract] |
Summary of basic and diluted net income per share | The following table presents the calculation of basic and diluted net income per share:
|  | Years ended December 31, |
(in thousands, except share and per share data) |  | 2017 |  |  | 2016 |  |  | 2015 |
Numerator: |  |  |  |  |  |  |  |  |
Net income from continuing operations |  | $ | 82,594 |  |  | $ | 62,524 |  |  | $ | 91,416 |
Interest expense, net of tax |  |  | 2,606 |  |  |  | 3,255 |  |  |  | 3,019 |
Amortization of debt issuance costs, net of tax |  |  | 681 |  |  |  | 781 |  |  |  | 868 |
Net income, adjusted from continuing operations |  |  | 85,881 |  |  |  | 66,560 |  |  |  | 95,303 |
Net loss from discontinued operations |  |  | - |  |  |  | (10,748 | ) |  |  | (28,546 | )
Net income, adjusted |  | $ | 85,881 |  |  | $ | 55,812 |  |  | $ | 66,757 |
Denominator: |  |  |  |  |  |  |  |  |  |  |  |
Weighted-average number of shares-basic |  |  | 41,816,431 |  |  |  | 40,184,159 |  |  |  | 38,595,435 |
Dilutive securities-equity awards |  |  | 1,115,244 |  |  |  | 1,054,453 |  |  |  | 939,882 |
Dilutive securities-convertible debt |  |  | 7,396,262 |  |  |  | 8,096,500 |  |  |  | 7,720,525 |
Weighted-average number of shares-diluted |  |  | 50,327,937 |  |  |  | 49,335,112 |  |  |  | 47,255,842 |
Net income per share-basic from continuing operations |  | $ | 1.98 |  |  | $ | 1.56 |  |  | $ | 2.37 |
Net loss per share-basic from discontinued operations |  |  | - |  |  |  | (0.27 | ) |  |  | (0.74 | )
Net income per share-basic |  | $ | 1.98 |  |  | $ | 1.29 |  |  | $ | 1.63 |
Net income per share-diluted from continuing operations |  | $ | 1.71 |  |  | $ | 1.35 |  |  | $ | 2.02 |
Net loss per share-diluted from discontinued operations |  |  | - |  |  |  | (0.22 | ) |  |  | (0.61 | )
Net income per share-diluted |  | $ | 1.71 |  |  | $ | 1.13 |  |  | $ | 1.41 |

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- Definition Tabular disclosure of an entity's basic and diluted earnings per share calculations, including a reconciliation of numerators and denominators of the basic and diluted per-share computations for income from continuing operations. + 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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