Stock Compensation - Restricted Stock and Performance Share Grants (Tables)

12 Months Ended

Dec. 31, 2018

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 as of the year ended December 31, 2018:

Performance Share Grants with Performance Conditions
Below threshold performance	—
Threshold performance	179,211
Target performance	407,950
Maximum performance	619,512

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, 2018		December 31, 2017		December 31, 2016
Stock Grants Outstanding Beginning of the Year at Target Achievement	536,860		386,171		272,353
New Stock Grants/Additional shares due to achievement in excess of target	97,529		295,243		287,091
Vested Grants	(93,948	)	(99,769	)	(172,749	)
Expired/Forfeited Grants	(1,842	)	(44,785	)	(524	)
Stock Grants Outstanding at Target Achievement	538,599		536,860		386,171

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, 2018		December 31, 2017		December 31, 2016
Expensed	$	2,564	$	2,889	$	3,847
Capitalized	1,232		555		296
	3,796		3,444		4,143
NDSI Plan	684		663		738
	$	4,480	$	4,107	$	4,881