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Stock Compensation Plans (Tables)
 6 Months Ended
Jun. 30, 2020
Share-based Payment Arrangement [Abstract]  
Summary of stock compensation expense and related net tax benefit
The following table presents a summary of the total share-based compensation expense and the related net tax (deficiencies) benefits associated with the Company’s various employee share-based compensation plans for the three and six months ended June 30, 2020 and 2019:
($ in thousands)Three Months Ended June 30,Six Months Ended June 30,
2020201920202019
Stock compensation costs$7,071  $8,081  $14,280  $15,525  
Related net tax (deficiencies) benefits for stock compensation plans$(9) $1  $(1,575) $4,708  
Summary of activity for time-based and performance-based restricted stock units
The following table presents a summary of the activities for the Company’s time-based and performance-based RSUs that will be settled in shares for the six months ended June 30, 2020. The number of outstanding performance-based RSUs stated below assumes the associated performance targets will be met at the target level:
Time-Based RSUsPerformance-Based RSUs
SharesWeighted-Average
Grant Date
Fair Value		SharesWeighted-Average
Grant Date
Fair Value
Outstanding, January 1, 2020
1,139,868  $57.78  386,483  $60.13  
Granted657,461  40.51  165,084  39.79  
Vested(251,526) 54.47  (131,597) 56.59  
Forfeited(100,371) 54.33  —  —  
Outstanding, June 30, 2020
1,445,432  $50.74  419,970  $53.24  
The following table presents a summary of the activities for the Company’s time-based RSUs that will be settled in cash for the six months ended June 30, 2020:
Shares
Outstanding, January 1, 2020
11,638  
Granted11,215  
Vested(723) 
Forfeited—  
Outstanding, June 30, 2020
22,130