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CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY - USD ($) $ in Thousands | Total | Class A [Member] | Class B [Member] | Retained Earnings [Member] | Retained Earnings [Member] Class A [Member] | Retained Earnings [Member] Class B [Member] | Accumulated Other Comprehensive (Loss) Income [Member] | Common Stock [Member] Class A [Member] | Common Stock [Member] Class B [Member] | Additional Paid-in Capital [Member]
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Balance at Dec. 31, 2013 | $ 228,702 |  |  | $ 207,993 |  |  | $ 645 | $ 217 | $ 933 | $ 18,914
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |
Cash dividends declared on common stock |  | $ (522) | $ (2,665) |  | $ (522) | $ (2,665) |  |  |  |
Issuance of restricted common stock | 0 |  |  |  |  |  |  |  | 38 | (38)
Forfeiture of restricted common stock | 0 |  |  |  |  |  |  |  | (2) | 2
Foreign currency translation adjustment | (11,255) |  |  |  |  |  | (11,255) |  |  |
Unrealized holding gains on marketable securities arising during the year net of taxes | 147 |  |  |  |  |  | 147 |  |  |
Increase in APIC pool associated with tax benefits related to restricted stock awards | 31 |  |  |  |  |  |  |  |  | 31
Stock-based compensation expense | 2,717 |  |  |  |  |  |  |  |  | 2,717
Change in unfunded SERP liability, net of taxes | (1,485) |  |  |  |  |  | (1,485) |  |  |
Net (loss) earnings | 8,603 | 1,492 | 7,111 | 8,603 |  |  |  |  |  |
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 | (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 | (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

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