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

12 Months Ended

Dec. 31, 2019

Share-based Payment Arrangement [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, 2019:

Performance Share Grants with Performance Conditions
Below threshold performance	—
Threshold performance	185,440
Target performance	370,862
Maximum performance	556,302

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, 2019		December 31, 2018		December 31, 2017
Stock Grants Outstanding Beginning of the Year at Target Achievement	538,599		536,860		386,171
New Stock Grants/Additional shares due to achievement in excess of target	160,471		97,529		295,243
Vested Grants	(188,032	)	(93,948	)	(99,769	)
Expired/Forfeited Grants	(101,665	)	(1,842	)	(44,785	)
Stock Grants Outstanding at Target Achievement	409,373		538,599		536,860

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, 2019		December 31, 2018		December 31, 2017
Expensed	$	2,667	$	2,564	$	2,889
Capitalized	760		1,232		555
	3,427		3,796		3,444
NDSI Plan	531		684		663
	$	3,958	$	4,480	$	4,107