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

3 Months Ended

Mar. 31, 2018

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, 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 share grants, assuming target achievement for outstanding performance share grants for the following periods:

	March 31, 2018		December 31, 2017
Stock grants outstanding beginning of the period at target achievement	536,860		386,171
New stock grants/additional shares due to maximum achievement	97,529		295,243
Vested grants	(81,828	)	(99,769	)
Expired/forfeited grants	—		(44,785	)
Stock grants outstanding end of period at target achievement	552,561		536,860

Summary of stock compensation costs for Employee and NDSI Plans

The following table summarizes stock compensation costs for the Company's 1998 Employee Stock Incentive Plan, or the Employee Plan, and NDSI Plan for the following periods:

($ in thousands)	Three Months Ended March 31,
Employee Plan:	2018		2017
Expensed	$	761	$	630
Capitalized	346		65
	1,107		695
NDSI Plan - Expensed	187		181
Total Stock Compensation Costs	$	1,294	$	876