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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, 2014 | $ 224,273 |  |  | $ 213,409 |  |  | $ (11,948) | $ 217 | $ 969 | $ 21,626
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |
Cash dividends declared on common stock |  | $ (522) | $ (2,713) |  | $ (522) | $ (2,713) |  |  |  |
Issuance of restricted common stock | 0 |  |  |  |  |  |  |  | 8 | (8)
Forfeiture of restricted common stock | 0 |  |  |  |  |  |  |  | (7) | 7
Foreign currency translation adjustment, net of taxes | (9,954) |  |  |  |  |  | (9,954) |  |  |
Unrealized holding gains on marketable securities arising during the year net of taxes | 5 |  |  |  |  |  | 5 |  |  |
Stock-based compensation expense | 2,815 |  |  |  |  |  |  |  |  | 2,815
Change in unfunded SERP liability, net of taxes | 21 |  |  |  |  |  | 21 |  |  |
Net (loss) earnings | 19,197 | 3,331 | 15,866 | 19,197 |  |  |  |  |  |
Balance at Dec. 31, 2015 | 233,122 |  |  | 229,371 |  |  | (21,876) | 217 | 970 | 24,440
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |
Cash dividends declared on common stock |  | (522) | (2,728) |  | (522) | (2,728) |  |  |  |
Issuance of restricted common stock | 0 |  |  |  |  |  |  |  | 18 | (18)
Forfeiture of restricted common stock | 0 |  |  |  |  |  |  |  | (3) | 3
Foreign currency translation adjustment, net of taxes | (9,671) |  |  |  |  |  | (9,671) |  |  |
Unrealized holding gains on marketable securities arising during the year net of taxes | (10) |  |  |  |  |  | (10) |  |  |
Stock-based compensation expense | 2,817 |  |  |  |  |  |  |  |  | 2,817
Change in unfunded SERP liability, net of taxes | 260 |  |  |  |  |  | 260 |  |  |
Net (loss) earnings | (64,834) | (11,408) | (53,426) | (64,834) |  |  |  |  |  |
Balance at Dec. 31, 2016 | 158,434 |  |  | 161,287 |  |  | (31,297) | 217 | 985 | 27,242
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |
Reclassification of APIC pool upon adoption of ASU 2016-09 | ASU 2016-09 [Member] | 0 |  |  | 1,696 |  |  |  |  |  | (1,696)
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 gains 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) |  |  |
Net (loss) earnings | (11,897) | $ (2,113) | $ (9,784) | (11,897) |  |  |  |  |  |
Balance at Dec. 31, 2017 | $ 157,960 |  |  | $ 147,807 |  |  | $ (19,625) | $ 217 | $ 986 | $ 28,575

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