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Consolidated Statements of Stockholders' Equity - USD ($) $ in Thousands | Common Class A [Member] Retained Earnings [Member] | Common Class A [Member] AOCI Attributable to Parent [Member] | Common Class A [Member] Common Stock, Common Class A [Member] | Common Class A [Member] Common Stock, Common Class B [Member] | Common Class A [Member] Treasury Stock, Common [Member] | Common Class A [Member] Additional Paid-in Capital [Member] | Common Class A [Member] | Common Class B [Member] Retained Earnings [Member] | Common Class B [Member] AOCI Attributable to Parent [Member] | Common Class B [Member] Common Stock, Common Class A [Member] | Common Class B [Member] Common Stock, Common Class B [Member] | Common Class B [Member] Treasury Stock, Common [Member] | Common Class B [Member] Additional Paid-in Capital [Member] | Common Class B [Member] | Retained Earnings [Member] | AOCI Attributable to Parent [Member] | Common Stock, Common Class A [Member] | Common Stock, Common Class B [Member] | Treasury Stock, Common [Member] | Additional Paid-in Capital [Member] | Total
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Balance at Dec. 31, 2021 |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 187,935 | $ (18,863) | $ 214 | $ 1,038 | $ 0 | $ 38,419 | $ 208,743
Net earnings |  |  |  |  |  |  | $ 8,598 |  |  |  |  |  |  | $ 44,091 | 52,689 | 0 | 0 | 0 | 0 | 0 | 52,689
Cash dividends declared on common stock | $ (514) | $ 0 | $ 0 | $ 0 | $ 0 | $ 0 | (514) | $ (2,922) | $ 0 | $ 0 | $ 0 | $ 0 | $ 0 | (2,922) |  |  |  |  |  |  |
Issuance of restricted common stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 0 | 0 | 33 | 0 | (33) | 0
Forfeiture of restricted common stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 0 | 0 | (4) | 0 |  | 0
Forfeiture of restricted common stock, APIC |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 4 |
Repurchase of treasury stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 0 | 0 | 0 | (349) | 0 | (349)
Foreign currency translation adjustment, net of taxes |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 | (8,196) | 0 | 0 | 0 | 0 | (8,196)
Unrealized gains on interest rate swap cash flow hedge, net of taxes of $0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 5,655 | 0 | 0 | 0 | 0 | 5,655
Unrealized holding losses on marketable securities, net of taxes of $0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 | (11) | 0 | 0 | 0 | 0 | (11)
Stock-based compensation expense |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 0 | 0 | 0 | 0 | 2,382 | 2,382
Change in unfunded SERP liability, net of taxes |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 4,869 | 0 | 0 | 0 | 0 | 4,869
Balance at Dec. 31, 2022 |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 237,188 | (16,546) | 214 | 1,067 | (349) | 40,772 | 262,346
Net earnings |  |  |  |  |  |  | 11,830 |  |  |  |  |  |  | 62,001 | 73,831 | 0 | 0 | 0 | 0 | 0 | 73,831
Cash dividends declared on common stock | $ (512) | $ 0 | $ 0 | $ 0 | $ 0 | $ 0 | $ (512) | $ (2,997) | $ 0 | $ 0 | $ 0 | $ 0 | $ 0 | $ (2,997) |  |  |  |  |  |  |
Issuance of restricted common stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 0 | 0 | 1 | 0 | (1) | 0
Forfeiture of restricted common stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 0 | 0 | (3) | 0 |  | 0
Forfeiture of restricted common stock, APIC |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3 |
Repurchase of treasury stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 0 | 0 | 0 | (105) | 0 | (105)
Foreign currency translation adjustment, net of taxes |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 6,684 | 0 | 0 | 0 | 0 | 6,684
Unrealized gains on interest rate swap cash flow hedge, net of taxes of $0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 | (1,579) | 0 | 0 | 0 | 0 | (1,579)
Unrealized holding losses on marketable securities, net of taxes of $0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 1 | 0 | 0 | 0 | 0 | 1
Stock-based compensation expense |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 0 | 0 | 0 | 0 | 3,486 | 3,486
Change in unfunded SERP liability, net of taxes |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 | (597) | 0 | 0 | 0 | 0 | (597)
Balance at Dec. 31, 2023 |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 307,510 | $ (12,037) | $ 214 | $ 1,065 | $ (454) | $ 44,260 | $ 340,558

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