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Stock-Based Compensation (Tables)
 12 Months Ended
Dec. 31, 2021
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Table Text Block]
In thousands202120202019
Operations and maintenance expense, for stock-based compensation$3,272 $3,525 $2,172 
Income tax benefit(866)(933)(575)
Net stock-based compensation effect on net income (loss)2,406 2,592 1,597 
Amounts capitalized for stock-based compensation$344 $841 $430 
Share-based Payment Arrangement, Option, Activity [Table Text Block]
Option
Shares		Weighted -
Average
Price Per Share
Intrinsic
Value
(In millions)
Balance outstanding and exercisable, December 31, 201855,938 $44.96 $0.9 
Exercised(45,000)44.79 1.0 
Forfeited— — n/a
Balance outstanding and exercisable, December 31, 201910,938 45.67 0.3 
Exercised(1,500)45.24 — 
Expired— — n/a
Balance outstanding and exercisable, December 31, 20209,438 45.74 — 
Exercised(9,438)45.74 — 
Expired— — n/a
Balance outstanding and exercisable, December 31, 2021— $— $— 
Share-based Payment Arrangement, Restricted Stock and Restricted Stock Unit, Activity [Table Text Block]
Number of RSUsWeighted -
Average
Price Per RSU
Nonvested, December 31, 201882,680 $56.47 
Granted36,018 65.29 
Vested(35,778)54.22 
Forfeited(3,187)63.89 
Nonvested, December 31, 201979,733 61.17 
Granted33,594 55.58 
Vested(29,273)59.29 
Forfeited(1,590)69.71 
Nonvested, December 31, 202082,464 59.40 
Granted38,160 49.16 
Vested(31,733)60.06 
Forfeited(1,164)46.82 
Nonvested, December 31, 202187,727 $54.87 
Share-based Payment Arrangement, Performance Shares, Outstanding Activity [Table Text Block]
The aggregate number of performance shares granted and outstanding at the target and maximum levels were as follows:
Dollars in thousandsPerformance Share Awards Outstanding2021
Performance PeriodTargetMaximumExpense
2019-2135,170 70,340 $1,322 
2020-22— — — 
2021-23— — — 
Total35,170 70,340 $1,322 
Long Term Incentive Plan [Member]  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Share-based Compensation Arrangements by Share-based Payment Award, Performance-Based Units, Vested and Expected to Vest [Table Text Block] The following table summarizes performance share expense information:
Dollars in thousands
Shares(1)
Expense During Award Year(2)
Total Expense for Award
Estimated award:
2019-2021 grant(3)
37,430 $1,322 $1,322 
Actual award:
2018-2020 grant31,600 $2,137 $2,137 
2017-2019 grant41,537 $572 $1,971 
(1)     In addition to common stock shares, a participant also receives a dividend equivalent cash payment equal to the number of shares of common stock received on the award payout multiplied by the aggregate cash dividends paid per share during the performance period.
(2)     Amount represents the expense recognized in the third year of the vesting period noted above. For the 2019-2021 grant, mutual understanding of the award's key terms was established in the third year of the vesting period, triggering full expense recognition in 2021.
(3)    This represents the estimated number of shares to be awarded as of December 31, 2021 as certain performance share measures have been achieved. Amounts are subject to change with final payout amounts authorized by the Board of Directors in February 2022.