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Consolidated Statements of Shareholders' Equity - USD ($) $ in Thousands | Cumulative Effect, Period of Adoption, Adjustment [Member] Common Stock [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member] Additional Paid-in Capital [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member] Retained Earnings [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member] AOCI Attributable to Parent [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member] Noncontrolling Interest [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member] | Common Stock [Member] | Additional Paid-in Capital [Member] | Retained Earnings [Member] | AOCI Attributable to Parent [Member] | Noncontrolling Interest [Member] | Total
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Balance (in shares) at Dec. 31, 2018 |  |  |  |  |  |  | 39,213,136 |  |  |  |  |
Balance at Dec. 31, 2018 |  |  |  |  |  |  | $ 415,805 | $ 54,717 | $ (21,751) | $ (61,218) | $ 4,420 | $ 391,973
Net earnings |  |  |  |  |  |  |  |  | 137,585 |  |  | 137,585
Pension liability adjustments, net of tax |  |  |  |  |  |  |  |  |  | (811) |  | (811)
Foreign currency translation gain (loss) |  |  |  |  |  |  |  |  |  | (185) |  | (185)
Unrealized loss on interest rate swaps, net of tax |  |  |  |  |  |  |  |  |  | (4,073) |  | (4,073)
Other comprehensive loss attributable to NCI |  |  |  |  |  |  |  |  |  | (877) | 233 | (644)
NCI share of earnings |  |  |  |  |  |  |  |  | (26,829) |  | 2,270 | (24,559)
NCI redemption increment |  |  |  |  |  |  |  |  | (7,853) |  |  | (7,853)
Distributions to NCI |  |  |  |  |  |  |  |  |  |  | (2,305) | (2,305)
Acquisitions of businesses, net |  |  |  |  |  |  |  |  |  |  | (195) | (195)
Subsidiaries’ equity transactions |  |  |  |  |  |  |  | 2,567 |  |  |  | 2,567
Stock option expense |  |  |  |  |  |  |  | 7,831 |  |  |  | $ 7,831
Stock options exercised (in shares) |  |  |  |  |  |  | 632,075 |  |  |  |  | 632,075
Stock options exercised |  |  |  |  |  |  | $ 26,348 | (4,409) |  |  |  | $ 21,939
Dividends |  |  |  |  |  |  |  |  | (3,971) |  |  | (3,971)
Balance (in shares) at Dec. 31, 2019 |  |  |  |  |  |  | 39,845,211 |  |  |  |  |
Balance at Dec. 31, 2019 |  |  | $ (2,824) |  |  | $ (2,824) | $ 442,153 | 60,706 | 77,181 | (67,164) | 4,423 | 517,299
Net earnings |  |  |  |  |  |  |  |  | 94,489 |  |  | 94,489
Pension liability adjustments, net of tax |  |  |  |  |  |  |  |  |  | (753) |  | (753)
Foreign currency translation gain (loss) |  |  |  |  |  |  |  |  |  | 2,591 |  | 2,591
Unrealized loss on interest rate swaps, net of tax |  |  |  |  |  |  |  |  |  | (2,448) |  | (2,448)
Other comprehensive loss attributable to NCI |  |  |  |  |  |  |  |  |  | 5,795 | (154) | 5,641
NCI share of earnings |  |  |  |  |  |  |  |  | (29,572) |  | 2,023 | (27,549)
NCI redemption increment |  |  |  |  |  |  |  |  | (15,843) |  |  | (15,843)
Distributions to NCI |  |  |  |  |  |  |  |  |  |  | (2,524) | (2,524)
Acquisitions of businesses, net |  |  |  |  |  |  |  |  |  |  | (65) | (65)
Subsidiaries’ equity transactions |  |  |  |  |  |  |  | 134 |  |  |  | 134
Stock option expense |  |  |  |  |  |  |  | 9,628 |  |  |  | $ 9,628
Stock options exercised (in shares) |  |  |  |  |  |  | 344,225 |  |  |  |  | 344,225
Stock options exercised |  |  |  |  |  |  | $ 15,840 | (3,497) |  |  |  | $ 12,343
Dividends |  |  |  |  |  |  |  |  | (4,010) |  |  | (4,010)
Balance (in shares) at Dec. 31, 2020 |  |  |  |  |  |  | 40,189,436 |  |  |  |  |
Balance at Dec. 31, 2020 |  |  |  |  |  |  | $ 457,993 | $ 66,971 | $ 119,421 | $ (61,979) | $ 3,703 | $ 586,109

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