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Summary of Significant Accounting Policies (Tables) | 12 Months Ended
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Dec. 31, 2017
Summary of Significant Accounting Policies [Abstract] |
Weighted-Average Common Shares for the Computation of EPS | The following table sets forth the computation of basic and diluted EPS from continuing operations for the years ended December 31:
|  | Years Ended December 31, |
(in thousands except per share amounts) |  | 2017 |  |  | 2016 |  |  | 2015 |
Numerator: |  |  |  |  |  |  |  |  |
Net earnings from continuing operations |  | $ | 89,600 |  |  | $ | 122,913 |  |  | $ | 107,247 |
Denominator: |  |  |  |  |  |  |  |  |  |  |  |
Denominator for basic EPS - weighted average common shares |  |  | 43,780 |  |  |  | 44,523 |  |  |  | 45,910 |
Effect of dilutive securities |  |  | 251 |  |  |  | 320 |  |  |  | 294 |
Denominator for diluted EPS - diluted weighted average shares outstanding |  |  | 44,031 |  |  |  | 44,843 |  |  |  | 46,204 |
EPS from continuing operations |  |  |  |  |  |  |  |  |  |  |  |
Basic |  | $ | 2.05 |  |  | $ | 2.76 |  |  | $ | 2.34 |
Diluted |  | $ | 2.03 |  |  | $ | 2.74 |  |  | $ | 2.32 |

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- Definition Tabular disclosure of the weighted average number of shares used in calculating basic net earnings per share (or unit) and 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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