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Employee Share Plans (Tables)
 12 Months Ended
Dec. 31, 2020
Share-based Payment Arrangement [Abstract]  
Schedule of Share-Based Compensation Awards (Before Income Tax Expense)
During the years ended December 31, 2020, 2019 and 2018, we recognized compensation expense (before income tax expense) for these awards as follows (in thousands):
 202020192018
Stock options$1,878 $1,848 $2,609 
Restricted stock units and awards4,960 4,375 4,257 
Performance share units2,031 1,031 — 
Total share-based compensation expense$8,869 $7,254 $6,866 
Stock Award Activity
Stock option activity during the year ended December 31, 2020 was as follows (number of options in thousands):
Number of
Options		Weighted
Average
Exercise Price
Per Share		Weighted
Average
Remaining
Contractual Term		Aggregate
Intrinsic
Value
(in millions)
Outstanding at December 31, 20192,412 $13.58 
Granted50 $24.62 
Exercised(634)$10.23 
Expired or canceled(8)$18.15 
Outstanding at December 31, 20201,820 $15.02 2.28 years$21.1 
Vested and exercisable at December 31, 20201,375 $14.00 2.04 years$17.3 
Schedule of Fair Value Option Award Weighted Average Assumptions Used The following weighted average assumptions were utilized:
 20202018
Expected volatility (1)27.27 %22.04 %
Expected option life (years) (2)4.674.62
Risk-free interest rate (3)0.19 %2.80 %
Expected dividend yield (4)— %— %

(1)The expected volatility assumption was determined based upon the historical volatility of our stock price, using daily price intervals.
(2)The expected option life was determined based upon our historical data using a midpoint scenario, which assumes all options are exercised halfway between the expiration date and the weighted average time it takes the option to vest.
(3)The risk-free interest rate assumption was upon zero-coupon U.S. Treasury bonds with a term approximating the expected life of the respective options.
(4)The expected dividend yield assumption was determined in view of our historical and estimated dividend payouts. We do not expect to change our dividend payout policy in the foreseeable future.
Schedule of Restricted Stock Award Activity
Restricted stock units and awards activity during the year ended December 31, 2020 was as follows (in thousands, except per share data):
Number of
Shares
Weighted
Average
Grant-Date
Fair Value (1)
Non-vested at December 31, 2019577 $17.87 
Granted178 $24.48 
Vested(276)$16.74 
Forfeited(18)$19.56 
Non-vested at December 31, 2020461 $21.03 
(1)Represents weighted average market value of the shares as the awards are granted at no cost to the recipients.
Schedule of PSU Award Activity
The following table presents our PSU award activity during the twelve months ended December 31, 2020 (in thousands, except per share data):
 Number of
PSUs
(in thousands)		Grant-Date
Fair Value
Per Unit
Outstanding at December 31, 2019200 $19.82 
Granted132 $25.75 
Expired or cancelled(25)$22.14 
Outstanding at December 31, 2020307 $22.18