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Summary of Significant Accounting Policies (Tables) | 6 Months Ended
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Jun. 30, 2017
Accounting Policies [Abstract] |
Components of basic and diluted weighted-average shares | The following table presents information about basic and diluted weighted-average shares outstanding:
|  | Three Months Ended June 30, |  | Six Months Ended June 30,
(in thousands) |  | 2017 |  | 2016 |  | 2017 |  | 2016
Numerator (for basic and diluted earnings per share) |  |  |  |  |  |  |  |
Net income |  | $ | 8,545 |  |  | $ | 11,488 |  |  | $ | 6,606 |  |  | $ | 16,376 |
Less income allocated to RSUs |  | (116 | ) |  | (159 | ) |  | (96 | ) |  | (203 | )
Numerator for basic and diluted earnings per share |  | $ | 8,429 |  |  | $ | 11,329 |  |  | $ | 6,510 |  |  | $ | 16,173 |
Denominator |  |  |  |  |  |  |  |
Basic weighted-average shares outstanding |  | 82,302 |  |  | 83,773 |  |  | 82,191 |  |  | 83,869 |
Effect of dilutive securities: |  |  |  |  |  |  |  |
Stock options held by employees and directors |  | 163 |  |  | 278 |  |  | 198 |  |  | 315 |
Diluted weighted-average shares outstanding |  | 82,465 |  |  | 84,051 |  |  | 82,389 |  |  | 84,184 |

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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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