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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] 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] 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] | Additional Paid-in Capital [Member] | Total
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Balance at Dec. 31, 2017 |  |  |  |  |  |  |  |  |  |  |  |  | $ 147,807 | $ (19,625) | $ 217 | $ 986 | $ 28,575 | $ 157,960
Net (loss) earnings |  |  |  |  |  | $ 3,521 |  |  |  |  |  | $ 17,188 | 20,709 |  |  |  |  | 20,709
Cash dividends declared on common stock | $ (522) |  |  |  |  | (522) | $ (2,796) |  |  |  |  | (2,796) |  |  |  |  |  |
Issuance of restricted common stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 26 | (26) |
Forfeiture of restricted common stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (3) |  |
Forfeiture of restricted common stock, APIC |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3 |
Foreign currency translation adjustment, net of taxes |  |  |  |  |  |  |  |  |  |  |  |  |  | (6,098) |  |  |  | (6,098)
Unrealized holding losses on marketable securities arising during the period, net of taxes of ($0) and ($85) |  |  |  |  |  |  |  |  |  |  |  |  |  | (133) |  |  |  | (133)
Stock-based compensation expense |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2,835 | 2,835
Change in unfunded SERP liability, net of taxes |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,018 |  |  |  | 1,018
Balance at Dec. 31, 2018 |  |  |  |  |  |  |  |  |  |  |  |  | 168,695 | (24,838) | 217 | 1,009 | 31,387 | 176,470
Effect of adoption of ASU |  |  |  |  |  |  |  |  |  |  |  |  | 3,497 |  |  |  |  | 3,497
Net (loss) earnings |  |  |  |  |  | (1,531) |  |  |  |  |  | (7,212) | (8,743) |  |  |  |  | (8,743)
Cash dividends declared on common stock | $ (518) |  |  |  |  | $ (518) | $ (2,834) |  |  |  |  | $ (2,834) |  |  |  |  |  |
Forfeiture of restricted common stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (3) |  |
Forfeiture of restricted common stock, APIC |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3 |
Foreign currency translation adjustment, net of taxes |  |  |  |  |  |  |  |  |  |  |  |  |  | 2,603 |  |  |  | 2,603
Unrealized holding losses on marketable securities arising during the period, net of taxes of ($0) and ($85) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock-based compensation expense |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2,888 | 2,888
Change in unfunded SERP liability, net of taxes |  |  |  |  |  |  |  |  |  |  |  |  |  | (1,367) |  |  |  | (1,367)
Issuance of stock awards |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 7 |  |
Issuance of stock awards, APIC |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (7) |
Repurchase of Class A common stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (3) |  | (445) | (448)
Balance at Dec. 31, 2019 |  |  |  |  |  |  |  |  |  |  |  |  | 157,063 | (24,065) | 214 | 1,013 | 33,826 | 168,051
Effect of adoption of ASU |  |  |  |  |  |  |  |  |  |  |  |  | $ 463 | $ (463) |  |  |  |

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