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Stock Compensation - Restricted Stock and Performance Share Grants (Tables) | 3 Months Ended
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Mar. 31, 2016
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 three months ended March 31, 2016:
Performance Share Grants with Performance Conditions
Below threshold performance |  | — |
Threshold performance |  | 205,712 |
Target performance |  | 377,385 |
Maximum performance |  | 569,972 |
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:
| March 31, 2016 |  | December 31, 2015
Stock grants outstanding beginning of the year at target achievement | 272,353 |  |  | 237,045 |
New stock grants/additional shares due to maximum achievement | 245,781 |  |  | 114,221 |
Vested grants | (36,028 | ) |  | (52,436 | )
Expired/forfeited grants | (524 | ) |  | (26,477 | )
Stock grants outstanding March 31, 2016 at target achievement | 481,582 |  |  | 272,353 |
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) | Three Months Ended
Employee Plan: | March 31, 2016 |  | March 31, 2015
Expensed | $ | 794 |  |  | $ | 741 |
Capitalized | 56 |  |  | 36 |
| 850 |  |  | 777 |
NDSI Plan - Expensed | 179 |  |  | 212 |
| $ | 1,029 |  |  | $ | 989 |

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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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