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STOCK-BASED COMPENSATION (Tables)
 12 Months Ended
Dec. 31, 2024
Share-Based Payment Arrangement [Abstract]  
Share-Based Payment Arrangement, Expensed and Capitalized, Amount During the years ended December 31, 2024, 2023 and 2022, the Company recorded compensation related to stock-based awards as follows:
Year Ended December 31,
202420232022
(Dollars in thousands)

Cost of revenues $9,169 $6,899 $6,382 
Selling and marketing expenses 921 866 1,230 
Research and development expenses144 94 — 
General and administrative expenses 9,963 7,620 4,034 
Total stock-based compensation expense 20,197 15,479 11,646 
Tax effect on stock-based compensation expense 1,998 1,598 1,270 
Net effect of stock-based compensation expense $18,199 $13,881 $10,376 
Schedule of Share-Based Payment Award, Valuation Assumptions The Company calculated the fair value of each stock-based award on the date of grant based on the following assumptions:
Year Ended December 31,
202420232022
For stock based awards issued by the Company:
Risk-free interest rates 4.5 %4.2 %1.7 %
Expected lives (in weighted average years) 2.22.55.3
Dividend yield 0.7 %0.6 %0.7 %
Expected volatility (weighted average) 31.9 %38.2 %34.6 %
The Company estimated the forfeiture rate (on a weighted average basis) as follows:
Year Ended December 31,
202420232022
Weighted average forfeiture rate 8.2 %8 %10.2 %
The Company calculated the fair value of each RSU and PSU on the grant date using the complex lattice, tree-based option-pricing model, and the Monte Carlo simulation, based on the following assumptions:
Risk-free interest rates4.27%—4.94%
Expected life (in years)1—3
Dividend yield0.73%
Expected volatility (weighted average)28.0%—34.0%
The Company calculated the fair value of each RSU and PSU on the grant date using the Complex Lattice, Tree-based option-pricing model based on the following assumptions:
Risk-free interest rates3.86%—4.68%
Expected life (in years)1—4
Dividend yield0.59%
Expected volatility (weighted average)36.0%—42.2%
The Company calculated the fair value of each RSU and PSU on the grant date using the complex lattice, tree-based option-pricing model based on the following assumptions:
Risk-free interest rates4.70%
Expected life (in years)1
Dividend yield0.56%
Expected volatility (weighted average)34.80%
The Company calculated the fair value of each RSU on the grant date using the Complex Lattice, Tree-based option-pricing model based on the following assumptions:
Risk-free interest rates4.13%—4.38%
Expected life (in years)2—3
Dividend yield0.56%
Expected volatility (weighted average)43.17%—40.57%
The Company calculated the fair value of each SAR on the grant date using the Complex Lattice, Tree-based option-pricing model based on the following assumptions:
Risk-free interest rates1.31%—1.62%
Expected life (in years)2—6
Dividend yield0.67%
Expected volatility (weighted average)32.85%—46.07%
Share-Based Payment Arrangement, Activity
Information on the awards outstanding and the related weighted average exercise price as of and for the years ended December 31, 2024, 2023 and 2022 are presented in the table below:
 
Year Ended December 31,
202420232022
Awards
(In thousands)		Weighted
Average
Exercise
Price		Awards
(In thousands)		Weighted
Average
Exercise
Price		Awards
(In thousands)		Weighted
Average
Exercise
Price
Outstanding at beginning of year 1,483 $52.57 1,810 $60.08 2,025 $58.70 
Granted:
SARs (1)
— — 0 0.00513 71.15
RSUs (2)
242 — 189 — 109 — 
PSUs (3)
61 — 35 — 20 — 
Exercised (377)62.91(492)56.00(728)52.73
Forfeited (29)64.16(59)54.09(129)62.27
Expired — — — — — — 
Outstanding at end of year 1,380 69.911,483 52.571,810 60.08
Options and SARs exercisable at end of year
614 69.41606 66.81749 58.30
Weighted-average fair value of awards granted during the year $64.95 $79.98 $33.02 
(1)    Upon exercise, SARs entitle the recipient to receive shares of common stock equal to the increase in value of the award between the grant date and the exercise date.
(2)     An RSU represents the right to receive one share of common stock once certain vesting conditions are met. The value of an RSU approximates the value of the underlying stock.
(3)     The Performance shares units shall be paid out based on achievement of three-year relative total stockholder return compared to other companies in the S&P 500 index or based on achievement of three-year megawatt COD capacity targets.
Share-Based Payment Arrangement, Exercise Price Range The following table summarizes information about stock-based awards outstanding at December 31, 2024 (shares in thousands):
 
Awards OutstandingAwards Exercisable
Exercise PriceNumber of
Stock-based
Awards
Outstanding		Weighted
Average
Remaining
Contractual
Life in Years		Aggregate
Intrinsic Value 		Number of
Stock-based
Awards
Exercisable		Weighted
Average
Remaining
Contractual
Life in Years		Aggregate
Intrinsic Value
$— 537 1.0$36,349 $— 
63.40 45 1.5196 45 1.5196 
67.54 7 1.81 7 1.91 
68.34 47 1.4— 47 1.4— 
69.14 335 1.4— 335 1.4— 
71.15 385 3.2— 160 3.2— 
71.71 4 0.6— 4 0.6— 
76.43 5 0.9— 5 0.9— 
76.54 9 2.9— 6 2.9— 
78.53 6 2.3— 5 2.4— 
90.28 1 2.0— 1 2.0— 
1,380 1.8$36,546 614 1.9$197 
The following table summarizes information about stock-based awards outstanding at December 31, 2023 (shares in thousands): 
Awards OutstandingAwards Exercisable
Exercise PriceNumber of
Stock-based
Awards
Outstanding		Weighted
Average
Remaining
Contractual
Life in Years		Aggregate
Intrinsic Value 		Number of
Stock-based
Awards
Exercisable		Weighted
Average
Remaining
Contractual
Life in Years		Aggregate
Intrinsic Value
$— 345 1.6$26,127 — 0.0$— 
51.71 8 1.0193 8 1.0193 
53.16 3 0.973 3 0.973 
53.44 78 0.51,736 78 0.51,736 
57.97 8 0.6134 8 0.6134 
63.40 45 2.5562 34 2.5422 
67.547 2.954 7 2.954 
68.3447 2.4349 35 2.4261 
69.144702.43,128 316 2.42,101 
71.154484.22,077 101 4.2468 
71.7141.616 4 1.616 
76.4351.9— 5 1.9— 
76.5493.9— 4 3.9— 
78.5363.3— 3 3.3— 
90.2813.0— — 3.0— 
1,483 2.6$34,449 606 2.4$5,458