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Equity Compensation Plans (Tables)
 6 Months Ended
Jun. 30, 2020
Share-based Payment Arrangement [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, 2020, as shown in the following table.
Table 18.1 – Activities of Equity Compensation Costs by Award Type
Six Months Ended June 30, 2020
(In Thousands)Restricted Stock AwardsRestricted Stock UnitsDeferred Stock UnitsPerformance Stock UnitsEmployee Stock Purchase PlanTotal
Unrecognized compensation cost at beginning of period
$1,990  $3,534  $17,858  $8,946  $—  $32,328  
Equity grants70  3,431  6,593  —  160  10,254  
Performance-based valuation adjustment—  —  —  (7,352) —  (7,352) 
Equity grant forfeitures(349) (1,266) (4,733) (648) —  (6,996) 
Equity compensation expense(614) (772) (4,511) 720  (80) (5,257) 
Unrecognized Compensation Cost at End of Period
$1,097  $4,927  $15,207  $1,666  $80  $22,977