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Equity Compensation Plans (Tables)
 6 Months Ended
Jun. 30, 2018
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Equity Compensation Costs by Award Type
The unamortized compensation cost of awards issued under the Incentive Plan and purchases under the Employee Stock Purchase Plan totaled $23 million at June 30, 2018, as shown in the following table.
Table 15.1 – Activities of Equity Compensation Costs by Award Type
 
 
Six Months Ended June 30, 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

 
4,750

 
350

 
136

 
7,616

Equity grant forfeitures
 
—

 
—

 
—

 
—

 
—

Equity compensation expense
 
(806
)
 
(4,371
)
 
(1,287
)
 
(68
)
 
(6,532
)
Unrecognized Compensation Cost at End of Period
 
$
4,382

 
$
13,743

 
$
4,361

 
$
68

 
$
22,554