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Equity Compensation Plans (Tables)
 3 Months Ended
Mar. 31, 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 $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