Equity Compensation Plans

At March 31, 2019 and December 31, 2018, 4,298,376 and 4,616,776 shares of common stock, respectively, were available for grant under our Incentive Plan. The unamortized compensation cost of awards issued under the Incentive Plan and purchases under the Employee Stock Purchase Plan totaled $29 million at March 31, 2019, as shown in the following table.

Table 18.1 – Activities of Equity Compensation Costs by Award Type



	Three Months Ended March 31, 2019
(In Thousands)	Restricted Stock Awards			Restricted Stock Units			Deferred Stock Units			Performance Stock Units			Employee Stock Purchase Plan			Total
Unrecognized compensation cost at beginning of period	$	3,498		$	74		$	14,489		$	7,061		$	—		$	25,122
Equity grants	—			2,953			3,951			—			160			7,064
Equity grant forfeitures	—			—			—			—			—			—
Equity compensation expense	(395		)	(66		)	(1,617		)	(835		)	(40		)	(2,953		)
Unrecognized Compensation Cost at End of Period	$	3,103		$	2,961		$	16,823		$	6,226		$	120		$	29,233

At March 31, 2019, the weighted average amortization period remaining for all of our equity awards was two years.

Restricted Stock Awards ("RSAs")

At March 31, 2019 and December 31, 2018, there were 218,022 and 339,482 shares, respectively, of RSAs outstanding. Restrictions on these shares lapse through 2022. During the three months ended March 31, 2019, there were no RSAs granted, restrictions on 116,584 RSAs lapsed and those shares were distributed, and no RSAs forfeited.

Restricted Stock Units ("RSUs")

At March 31, 2019 and December 31, 2018, there were 197,480 and 4,876 shares, respectively, of RSUs outstanding. Restrictions on these shares lapse through 2023. During the three months ended March 31, 2019, there were 192,604 RSUs granted, no RSUs distributed, and no RSUs forfeited.

Deferred Stock Units (“DSUs”)

At March 31, 2019 and December 31, 2018, there were 2,396,886 and 2,336,720 DSUs, respectively, outstanding of which 1,119,692 and 1,181,622, respectively, had vested. During the three months ended March 31, 2019, there were 266,173 DSUs granted, 206,007 DSUs distributed, and no DSUs forfeited. Unvested DSUs at March 31, 2019 vest through 2023.

Performance Stock Units (“PSUs”)

At both March 31, 2019 and December 31, 2018, the target number of PSUs that were unvested was 725,616. Vesting for all PSUs will generally occur at the end of three years from their grant date based on various TSR performance calculations, as discussed in our Annual Report on Form 10-K for the year ended December 31, 2018.

Employee Stock Purchase Plan ("ESPP")

The ESPP allows a maximum of 450,000 shares of common stock to be purchased in aggregate for all employees. As of March 31, 2019 and December 31, 2018, 397,945 and 390,569 shares had been purchased, respectively, and there remained a negligible amount of uninvested employee contributions in the ESPP at March 31, 2019.