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Equity Compensation Plans (Tables)
 3 Months Ended
Mar. 31, 2016
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Equity Compensation Plans
The unamortized compensation cost of awards issued under the Incentive Plan and purchases under the Employee Stock Purchase Plan totaled $20 million at March 31, 2016, as shown in the following table.
Table 17.1 – Activities of Equity Compensation Costs by Award Type
 
 
Three Months Ended March 31, 2016
(In Thousands)
 
Restricted Stock
 
Deferred Stock Units
 
Performance Stock Units
 
Employee Stock Purchase Plan
 
Total
Unrecognized compensation cost at beginning of period
 
$
2,393

 
$
14,392

 
$
6,823

 
$
—

 
$
23,608

Equity grants
 
1,741

 
3,355

 
—

 
124

 
5,220

Equity grant forfeitures
 
(1,119
)
 
(150
)
 
(2,209
)
 
—

 
(3,478
)
Equity compensation (expense) income
 
17

 
(4,712
)
 
(1,092
)
 
(31
)
 
(5,818
)
Unrecognized Compensation Cost at End of Period
 
$
3,032

 
$
12,885

 
$
3,522

 
$
93

 
$
19,532