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CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY - USD ($) $ in Thousands | Total | Class A Common Stock [Member] | Class B Common Stock [Member] | Retained Earnings [Member] | Retained Earnings [Member] Class A Common Stock [Member] | Retained Earnings [Member] Class B Common Stock [Member] | Accumulated Other Comprehensive (Loss) Income [Member] | Common Stock [Member] Class A Common Stock [Member] | Common Stock [Member] Class B Common Stock [Member] | Additional Paid-in Capital [Member]
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Balance at Dec. 31, 2016 | $ 158,434 |  |  | $ 161,287 |  |  | $ (31,297) | $ 217 | $ 985 | $ 27,242
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |
Cash dividends declared on common stock |  | $ (522) | $ (2,757) |  | $ (522) | $ (2,757) |  |  |  |
Issuance of restricted common stock | 0 |  |  |  |  |  |  |  | 5 | (5)
Forfeiture of restricted common stock | 0 |  |  |  |  |  |  |  | (4) | 4
Foreign currency translation adjustment, net of taxes | 12,439 |  |  |  |  |  | 12,439 |  |  |
Unrealized holding losses on marketable securities arising during the year, net of taxes | (279) |  |  |  |  |  | (279) |  |  |
Stock-based compensation expense | 3,030 |  |  |  |  |  |  |  |  | 3,030
Change in unfunded SERP liability, net of taxes | (488) |  |  |  |  |  | (488) |  |  |
Reclassification of APIC pool upon adoption of ASU 2016-09 | ASU 2016-09 [Member] | 0 |  |  | 1,696 |  |  |  |  |  | (1,696)
Net earnings (loss) | (11,897) | (2,113) | (9,784) | (11,897) |  |  |  |  |  |
Balance at Dec. 31, 2017 | 157,960 |  |  | 147,807 |  |  | (19,625) | 217 | 986 | 28,575
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |
Effect of adoption of ASU 2014-09 (Topic 606) | ASU 2014-09 [Member] | 3,497 |  |  | 3,497 |  |  |  |  |  |
Cash dividends declared on common stock |  | (522) | (2,796) |  | $ (522) | $ (2,796) |  |  |  |
Issuance of restricted common stock | 0 |  |  |  |  |  |  |  | 26 | (26)
Forfeiture of restricted common stock | 0 |  |  |  |  |  |  |  | (3) | 3
Foreign currency translation adjustment, net of taxes | (6,098) |  |  |  |  |  | (6,098) |  |  |
Unrealized holding losses on marketable securities arising during the year, net of taxes | (133) |  |  |  |  |  | (133) |  |  |
Stock-based compensation expense | 2,835 |  |  |  |  |  |  |  |  | 2,835
Change in unfunded SERP liability, net of taxes | 1,018 |  |  |  |  |  | 1,018 |  |  |
Net earnings (loss) | 20,709 | $ 3,521 | $ 17,188 | 20,709 |  |  |  |  |  |
Balance at Dec. 31, 2018 | $ 176,470 |  |  | $ 168,695 |  |  | $ (24,838) | $ 217 | $ 1,009 | $ 31,387

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