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Stock Based Compensation Expense (Tables) | 6 Months Ended
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Jun. 30, 2013
Summary of Option Activity | Option activity within each plan is as follows:
|  | Incentive Stock Option Plans |  |  | Weighted Average Price Per Share |  |  | Exercisable Weighted Average Price Per Share |
Balance outstanding, December 31, 2012 |  |  | 705,345 |  |  | $ | 7.70 |  |  | $ | 7.95 |
Options granted |  |  | — |  |  |  | — |  |  |  |  |
Options exercised, $7.50 |  |  | (6,666 | ) |  |  | 7.50 |  |  |  |  |
Options expired or forfeited |  |  | (6,667 | ) |  |  | 7.50 |  |  |  |  |
Balance outstanding, March 31, 2013 |  |  | 692,012 |  |  | $ | 7.71 |  |  | $ | 7.96 |
Options granted |  |  | — |  |  |  | — |  |  |  |  |
Options exercised, $7.50 |  |  | (13,333 | ) |  |  | 7.50 |  |  |  |  |
Options expired or forfeited |  |  | — |  |  |  | — |  |  |  |  |
Balance outstanding, June 30, 2013 |  |  | 678,679 |  |  | $ | 7.71 |  |  | $ | 8.07 |
Summary of Stock Options Summarized by Exercise Price | Information relating to stock options at June 30, 2013 summarized by exercise price is as follows:
|  | Outstanding Weighted Average |  |  | Exercisable Weighted Average |
Exercise Price Per Share |  | Shares |  |  | Remaining Life (Months) |  |  | Exercise Price |  |  | Shares |  |  | Exercise Price |
Incentive Stock Option Plan: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
$7.50 |  |  | 652,000 |  |  |  | 85 |  |  | $ | 7.50 |  |  |  | 146,000 |  |  | $ | 7.50 |
$11.32—$14.75 |  |  | 26,679 |  |  |  | 86 |  |  | $ | 12.90 |  |  |  | 16,679 |  |  | $ | 13.08 |
|  |  | 678,679 |  |  |  |  |  |  | $ | 7.71 |  |  |  | 162,679 |  |  | $ | 8.07 |
Weighted Average Exercise Prices for Options Granted and Exercisable and Weighted Average Remaining Contractual Life for Options Outstanding | The weighted average exercise prices for options granted and exercisable and the weighted average remaining contractual life for options outstanding as of June 30, 2013 was as follows:
|  | Number of Shares |  |  | Weighted Average Exercise Price |  |  | Weighted Average Remaining Contractual Life (Months) |  |  | Intrinsic Value (thousands) |
As of June 30, 2013: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Incentive Stock Option Plans: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Outstanding |  |  | 678,679 |  |  | $ | 7.71 |  |  |  | 85 |  |  | $ | 10,633 |
Expected to Vest |  |  | 674,823 |  |  | $ | 7.71 |  |  |  | 85 |  |  | $ | 10,573 |
Exercisable |  |  | 162,679 |  |  | $ | 8.07 |  |  |  | 72 |  |  | $ | 2,490 |
Summary of Non-Vested Shares | Restricted Shares—A status summary of non-vested shares as of and for the six months ended June 30, 2013 is presented below:
|  | Number of Shares |  |  | Weighted Average Grant- Date Fair Value |
Nonvested shares at December 31, 2012 |  |  | 245,817 |  |  | $ | 20.23 |
Granted |  |  | 145,884 |  |  | $ | 31.27 |
Vested |  |  | — |  |  | $ | — |
Forfeited |  |  | (8,000 | ) |  | $ | 22.17 |
Nonvested shares at March 31, 2013 |  |  | 383,701 |  |  | $ | 24.39 |
Granted |  |  | 8,230 |  |  | $ | 30.37 |
Vested |  |  | (8,230 | ) |  | $ | 30.37 |
Forfeited |  |  | — |  |  | $ | — |
Nonvested shares at June 30, 2013 |  |  | 383,701 |  |  | $ | 24.39 |
Performance Shares |
Summary of Non-Vested Shares | Performance Based Shares—A status summary of non-vested performance based shares as of and for the six months ended June 30, 2013 is presented below:
|  | Number of Shares |  |  | Weighted Average Grant- Date Fair Value |
Nonvested shares at March 31, 2013 |  |  | — |  |  | $ | — |
Granted |  |  | 26,942 |  |  | $ | 30.13 |
Vested |  |  | — |  |  | $ | — |
Forfeited |  |  | — |  |  | $ | — |
Nonvested shares at June 30, 2013 |  |  | 26,942 |  |  | $ | 30.13 |

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- Definition Tabular disclosure of option exercise prices, by grouped ranges, including the upper and lower limits of the price range, the number of shares under option, weighted average exercise price and remaining contractual option terms. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure of the number and weighted-average exercise prices (or conversion ratios) for share options (or share units) that were outstanding at the beginning and end of the year, vested and expected to vest, exercisable or convertible at the end of the year, and the number of share options or share units that were granted, exercised or converted, forfeited, and expired during the year. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure of the number of fully vested share options (or share units) and share options expected to vest at the date of the latest statement of financial position, weighted-average exercise price (or conversion ratio), aggregate intrinsic value (except for nonpublic entities), and weighted-average remaining contractual term for both options (or share units) currently outstanding and options (or share units) exercisable (or convertible). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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