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Stock Compensation - Restricted Stock and Performance Share Grants (Tables) | 12 Months Ended
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Dec. 31, 2017
Stock Compensation - Restricted Stock and Performance Share Grants [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 year ended December 31, 2017:
Performance Share Grants with Performance Conditions
Below threshold performance |  | — |
Threshold performance |  | 169,178 |
Target performance |  | 387,886 |
Maximum performance |  | 589,415 |
Summary of stock grant activity | The following is a summary of the Company’s stock grant activity, both time and performance unit grants, assuming target achievement for outstanding performance grants for the following twelve-month periods ended:
| December 31, 2017 |  | December 31, 2016 |  | December 31, 2015
Stock Grants Outstanding Beginning of the Year at Target Achievement | 386,171 |  |  | 272,353 |  |  | 237,045 |
New Stock Grants/Additional shares due to achievement in excess of target | 295,243 |  |  | 287,091 |  |  | 114,221 |
Vested Grants | (99,769 | ) |  | (172,749 | ) |  | (52,436 | )
Expired/Forfeited Grants | (44,785 | ) |  | (524 | ) |  | (26,477 | )
Stock Grants Outstanding at Target Achievement | 536,860 |  |  | 386,171 |  |  | 272,353 |
Summary of stock compensation costs for Employee and NDSI Plans | The following table summarizes stock compensation costs for the Company's 1998 Stock Incentive Plan, or the Employee 1998 Plan, and NDSI Plan for the following periods:
Employee 1998 Plan ($ in thousands): |  | December 31, 2017 |  | December 31, 2016 |  | December 31, 2015
Expensed |  | $ | 2,889 |  |  | $ | 3,847 |  |  | $ | 2,989 |
Capitalized |  | 555 |  |  | 296 |  |  | 165 |
|  | 3,444 |  |  | 4,143 |  |  | 3,154 |
NDSI Plan |  | 663 |  |  | 738 |  |  | 768 |
|  | $ | 4,107 |  |  | $ | 4,881 |  |  | $ | 3,922 |

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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=96867065&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=96867065&loc=d3e5070-113901 + Details
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