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Stock Compensation - Restricted Stock and Performance Share Grants (Tables) | 6 Months Ended
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Jun. 30, 2015
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |
Summary of performance share grants with performance conditions | The following is a summary of the Company's performance share grants with performance conditions for the six months ended June 30, 2015:
Performance Share Grants with Performance Conditions
Below threshold performance |  | — |
Threshold performance |  | 99,184 |
Target performance |  | 184,862 |
Maximum performance |  | 340,129 |
Summary of stock grant activity | The following is a summary of the Company’s stock grant activity, both time and performance share grants, assuming target achievement for outstanding performance share grants for the following periods:
| June 30, 2015 |  | December 31, 2014
Stock grants outstanding beginning of the year at target achievement | 237,045 |  |  | 265,701 |
New stock grants/additional shares due to maximum achievement | 83,968 |  |  | 165,996 |
Vested grants | (29,941 | ) |  | (41,694 | )
Expired/forfeited grants | — |  |  | (152,958 | )
Stock grants outstanding June 30, 2015 at target achievement | 291,072 |  |  | 237,045 |
Summary of stock compensation costs for Employee and NDSI Plans | The following table summarizes stock compensation costs for the Company's Employee 1998 Stock Incentive Plan, or the Employee Plan, and NDSI Plan for the following periods:
($ in thousands) |  | Six Months Ended |  | Six Months Ended
Employee Plan: |  | June 30, 2015 |  | June 30, 2014
Expensed |  | $ | 1,488 |  |  | $ | 1,148 |
Capitalized |  | 68 |  |  | 46 |
|  | 1,556 |  |  | 1,194 |
NDSI Plan - Expensed |  | 412 |  |  | 414 |
|  | $ | 1,968 |  |  | $ | 1,608 |

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- Definition Schedule of Share-based Payment Award, Performance Share Awards Granted, by Performance Conditions [Table Text Block] + References No definition available. + Details
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- Definition Tabular disclosure of the amount of total share-based compensation cost, including the amounts attributable to each share-based compensation plan and any related tax benefits. + 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 (h)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure of the changes in outstanding nonvested shares. + 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)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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