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Stock Compensation (Tables)
9 Months Ended
Sep. 30, 2013
Share-based Compensation [Abstract]  
Schedule of performance share awards granted, by performance conditions
The payouts at each performance goal are as follows:
Performance Share Grants with Performance Conditions (in shares)
Below threshold performance
 

Threshold performance
 
82,878

Target performance
 
407,757

Maximum performance
 
595,575

Summary of stock grant activity
The following is a summary of the Company’s stock grant activity assuming target achievement for outstanding performance grants for the following periods:
 
September 30, 2013
 
December 31, 2012
Stock Grants Outstanding Beginning of the Year
688,041

 
744,508

New Stock Grants/Estimated additional shares maximum performance
96,087

 
113,643

Vested Grants
(62,997
)
 
(170,110
)
Expired/Forfeited Grants
(221,552
)
 

Stock Grants Outstanding September 30, 2013
499,579

 
688,041

Schedule of employee service share-based compensation, allocation of recognized period costs
The following table summarizes stock compensation costs for the Company's 1998 Stock Incentive Plan, or Employee 1998 Plan, and the NDSI Plan for the following periods:
 
 
Nine Months Ended
 
Nine Months Ended
Employee 1998 Plan:
 
September 30,
2013
 
September 30,
2012
    Expensed
 
$
17,000

 
$
3,898,000

    Capitalized
 
245,000

 
281,000

 
 
262,000

 
4,179,000

NDSI Plan
 
384,000

 
286,000

 
 
$
646,000

 
$
4,465,000