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Earnings per Share (Tables) | 6 Months Ended
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Jun. 30, 2018
Earnings Per Share [Abstract] |
Composition of Weighted-Average Common Shares (Denominator) Used in Basic and Diluted Earnings Per Share | The following table summarizes the composition of the weighted-average common shares (denominator) used in the basic and diluted earnings per share computations:
| For the Three Months Ended June 30, |  | For the Six Months Ended June 30,
| 2018 |  | 2017 |  | 2018 |  | 2017
Weighted average common shares issued | 113,914,902 |  |  | 113,731,354 |  |  | 113,914,902 |  |  | 109,669,968 |
Average treasury stock shares | (14,460,352 | ) |  | (16,435,520 | ) |  | (15,409,475 | ) |  | (16,481,109 | )
Average deferred compensation shares | (37,411 | ) |  | — |  |  | (37,411 | ) |  | — |
Average unearned nonvested shares | (112,130 | ) |  | (112,235 | ) |  | (93,772 | ) |  | (109,313 | )
Weighted average common shares and common stock equivalents used to calculate basic earnings per share | 99,305,009 |  |  | 97,183,599 |  |  | 98,374,244 |  |  | 93,079,546 |
Additional common stock equivalents (nonvested stock) used to calculate diluted earnings per share | 161,989 |  |  | 48,689 |  |  | 117,505 |  |  | 46,393 |
Additional common stock equivalents (deferred compensation) used to calculate diluted earnings per share | 37,411 |  |  | — |  |  | 37,411 |  |  | — |
Weighted average common shares and common stock equivalents used to calculate diluted earnings per share | 99,504,409 |  |  | 97,232,288 |  |  | 98,529,160 |  |  | 93,125,939 |
Common Stock Equivalents Not Included in Computation of Diluted Earnings Per Share | The following table shows the number of shares and the price per share related to common stock equivalents that were not included in the computation of diluted earnings per share for the six months ended June 30 because to do so would have been antidilutive.
| 2018 |  | 2017
|  |  | Price Range |  |  |  | Price Range
| Shares |  | From |  | To |  | Shares |  | From |  | To
Restricted Stock | 55,607 |  |  | $ | 13.96 |  |  | $ | 14.49 |  |  | 26,022 |  |  | $ | 9.26 |  |  | $ | 13.96 |
Restricted Stock Units | 61,065 |  |  | $ | 14.17 |  |  | $ | 15.83 |  |  | 24,375 |  |  | $ | 15.09 |  |  | $ | 15.09 |

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- Definition Tabular disclosure of securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) in the future that were not included in the computation of diluted EPS because to do so would increase EPS amounts or decrease loss per share amounts for the period presented, by antidilutive securities. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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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://fasb.org/us-gaap/role/ref/legacyRef -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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