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Earnings Per Share (Tables) | 12 Months Ended
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Dec. 31, 2015
Earnings Per Share [Abstract] |
Reconciliation of Basic and Diluted Earnings Per Share | The following is a reconciliation of the basic and diluted earnings per share computation:
|  | Year Ended December 31, |
|  | 2015 |  |  | 2014 |  |  | 2013 |
|  | (shares in thousands) |
Net income |  | $ | 80,052 |  |  | $ | 61,051 |  |  | $ | 51,537 |
Shares of common stock and common stock equivalents: |  |  |  |  |  |  |  |  |  |  |  |
Weighted average shares used in basic computation |  |  | 137,242 |  |  |  | 131,770 |  |  |  | 126,651 |
Dilutive effect of common stock equivalents |  |  | 1,583 |  |  |  | 6,781 |  |  |  | 13,146 |
Weighted average shares used in dilutive computation |  |  | 138,825 |  |  |  | 138,551 |  |  |  | 139,797 |
Basic earnings per share |  | $ | 0.58 |  |  | $ | 0.46 |  |  | $ | 0.41 |
Diluted earnings per share |  | $ | 0.58 |  |  | $ | 0.44 |  |  | $ | 0.37 |

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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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