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Equity Compensation Plans
 3 Months Ended
Mar. 31, 2018
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Equity Compensation Plans
Equity Compensation Plans
At March 31, 2018 and December 31, 2017, 999,636 and 1,356,438 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 $25 million at March 31, 2018, as shown in the following table.
Table 16.1 – Activities of Equity Compensation Costs by Award Type
 
 
Three Months Ended March 31, 2018
(In Thousands)
 
Restricted Stock
 
Deferred Stock Units
 
Performance Stock Units
 
Employee Stock Purchase Plan
 
Total
Unrecognized compensation cost at beginning of period
 
$
2,808

 
$
13,364

 
$
5,298

 
$
—

 
$
21,470

Equity grants
 
2,380

 
3,450

 
—

 
136

 
5,966

Equity grant forfeitures
 
—

 
—

 
—

 
—

 
—

Equity compensation expense
 
(353
)
 
(1,673
)
 
(637
)
 
(34
)
 
(2,697
)
Unrecognized Compensation Cost at End of Period
 
$
4,835

 
$
15,141

 
$
4,661

 
$
102

 
$
24,739


At March 31, 2018, the weighted average amortization period remaining for all of our equity awards was less than two years.
Restricted Stock
At March 31, 2018 and December 31, 2017, there were 337,253 and 257,507 shares, respectively, of restricted stock outstanding. Restrictions on these shares lapse through 2022. During the three months ended March 31, 2018, there were 162,330 shares of restricted stock granted, restrictions on 82,584 shares of restricted stock lapsed and those shares were distributed, and no shares of restricted stock awards were forfeited.
Deferred Stock Units (“DSUs”)
At March 31, 2018 and December 31, 2017, there were 2,179,977 and 1,878,491 DSUs, respectively, outstanding of which 1,050,211 and 889,835, respectively, had vested. During the three months ended March 31, 2018, there were 301,485 DSUs granted, no DSUs distributed, and no DSUs forfeited. Unvested DSUs at March 31, 2018 vest through 2022.
Performance Stock Units (“PSUs”)
At both March 31, 2018 and December 31, 2017, the target number of PSUs that were unvested was 704,270. Vesting for PSUs will generally occur at the end of three years from their grant date based on various total shareholder return (“TSR”) performance calculations, as discussed in our Annual Report on Form 10-K for the year ended December 31, 2017.
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, 2018 and December 31, 2017, 367,844 and 361,006 shares had been purchased, respectively, and there remained a negligible amount of uninvested employee contributions in the ESPP at March 31, 2018.