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Equity Compensation Plans (Tables)
 6 Months Ended
Jun. 30, 2021
Share-based Payment Arrangement [Abstract]  
Equity Compensation Costs by Award Type The unamortized compensation cost of awards issued under the Incentive Plan, which are settled by delivery of shares of common stock and purchases under the Employee Stock Purchase Plan, totaled $27 million at June 30, 2021, as shown in the following table.
Table 18.1 – Activities of Equity Compensation Costs by Award Type
Six Months Ended June 30, 2021
(In Thousands)Restricted Stock AwardsRestricted Stock UnitsDeferred Stock UnitsPerformance Stock UnitsEmployee Stock Purchase PlanTotal
Unrecognized compensation cost at beginning of period$564 $3,540 $17,766 $5,794 $— $27,664 
Equity grants— 2,370 3,141 — 259 5,770 
Performance-based valuation adjustment— — — 1,072 — 1,072 
Equity grant forfeitures(2)(610)(550)— — (1,162)
Equity compensation expense(271)(752)(3,629)(1,355)(130)(6,137)
Unrecognized Compensation Cost at End of Period$291 $4,548 $16,728 $5,511 $129 $27,207