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Computation of Basic and Diluted Earnings per Common Share (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2021
 [1]
Dec. 31, 2020
 [2]
Dec. 31, 2019
 [3]
Numerators:      
Consolidated net income $ 50,331 $ 44,521 $ 40,773
Denominators:      
Weighted average common shares outstanding—basic 35,396 35,144 35,030
Dilutive potential common shares 385 510 516
Weighted average common shares outstanding— diluted 35,781 35,654 35,546
Antidilutive potential common shares excluded from above 13 13 41
Earnings per Common Share:      
Basic $ 1.42 $ 1.27 $ 1.16
Diluted $ 1.41 $ 1.25 $ 1.15
[1] For the year ended December 31, 2021, 45 shares of non-GAAP EPS performance-based restricted stock units and 37 shares of operating cash flow performance-based restricted stock units granted to certain members of the executive management team and 213 shares of restricted stock issued to Laser Quantum former non-controlling interest shareholders are considered contingently issuable shares and were excluded from the calculation of the denominator as the contingent conditions had not been met as of December 31, 2021.
[2] For the year ended December 31, 2020, 45 shares of non-GAAP EPS performance-based restricted stock units granted to certain members of the executive management team and 213 shares of restricted stock issued to Laser Quantum former non-controlling interest shareholders were considered contingently issuable shares and were excluded from the calculation of the denominator as the contingent conditions had not been met as of December 31, 2020.
[3] For the year ended December 31, 2019, 46 shares of non-GAAP EPS performance-based restricted stock units granted to certain members of the executive management team and 213 shares of restricted stock issued to Laser Quantum former non-controlling interest shareholders were considered contingently issuable shares and were excluded from the calculation of the denominator as the contingent conditions had not been met as of December 31, 2019.