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STOCK-BASED COMPENSATION AND EMPLOYEE BENEFIT PLANS (Tables)
 12 Months Ended
Dec. 31, 2020
Share-based Payment Arrangement [Abstract]  
Schedule of stock-based compensation expense
The following table presents stock-based compensation expense included in the Company’s consolidated statements of income (in thousands):
Year Ended December 31,
202020192018
State enterprise cost of revenues, exclusive of depreciation & amortization
$1,585 $1,499 $1,516 
Software & services cost of revenues, exclusive of depreciation & amortization
162 101 151 
Selling & administrative4,599 4,495 3,994 
Enterprise technology & product support812 674 677 
Stock-based compensation expense before income taxes
$7,158 $6,769 $6,338 
Schedule of service-based restricted stock activity
A summary of service-based restricted stock activity for the year ended December 31, 2020 is presented below:
Service-based Restricted
Shares		Weighted
Average
Grant Date
Fair Value
Outstanding at January 1, 2020712,162 $16.81 
Granted341,273 $21.12 
Vested(298,479)$17.20 
Canceled(23,830)$17.53 
Outstanding at December 31, 2020731,126 $18.64 
Expected to vest at December 31, 2020731,126 $18.64 
Schedule of performance-based restricted stock activity
A summary of performance-based restricted stock activity for the year ended December 31, 2020 is presented below:
Performance-
based
Restricted
Shares		Weighted
Average
Grant Date
Fair Value
Outstanding at January 1, 2020338,470 $17.01 
Granted137,052 $20.55 
Vested— $22.00 
Canceled(87,241)$22.00 
Outstanding at December 31, 2020388,281 $17.14 
Expected to vest at December 31, 2020149,801 $18.48 
Schedule of assumptions used to estimate fair value of offerings
The fair values of the offerings were estimated on the dates of grant using the Black-Scholes model using the assumptions in the following table.
Offering Ending March 31, 2021Offering Ending March 31, 2020Offering Ending March 31, 2019
Risk-free interest rate0.16 %2.41 %2.08 %
Expected dividend yield1.90 %1.93 %2.06 %
Expected life1.0 year1.0 year1.0 year
Expected stock price volatility41.09 %29.94 %35.51 %
Weighted average fair value of ESPP rights$6.37 $4.49 $3.75