v3.4.0.3

Condensed Consolidated Statements of Shareholders' Equity (Unaudited) - USD ($) shares in Thousands, $ in Thousands | Total | Non-Voting Common Stock [Member] | Voting Common Stock [Member] | Additional Paid-in Capital [Member] | AOCI Attributable to Parent [Member] | Retained Earnings [Member] | Treasury Stock [Member]
--- | --- | --- | --- | --- | --- | --- | ---
Balance at Dec. 31, 2014 | $ 597,068 | $ 1,258 | $ 291 | $ 301,533 | $ (211) | $ 294,197 |
Balance, Shares at Dec. 31, 2014 |  | 12,576 | 2,906 |  |  |  |
Net earnings | 10,363 |  |  |  |  | 10,363 |
Unrealized gain on short-term investments | 85 |  |  |  | 85 |  |
Amortization of unearned stock-based compensation | 1,719 |  |  | 1,719 |  |  |
Issuance of non-voting common stock (upon vesting of restricted stock units) | 16 | $ 16 |  |  |  |  |
Issuance of non-voting common stock (upon vesting of restricted stock units), shares |  | 164 |  |  |  |  |
Cancellation of restricted non-voting stock units for tax withholdings on vested shares | (2,089) | $ (7) |  | (2,082) |  |  |
Cancellation of restricted non-voting stock units for tax withholdings on vested shares, shares |  | (66) |  |  |  |  |
Purchase of treasury stock | (135) |  |  |  |  |  | $ (135)
Other | 24 |  |  |  | 24 |  |
Balance at Mar. 31, 2015 | 607,051 | $ 1,267 | $ 291 | 301,170 | (102) | 304,560 | $ (135)
Balance, Shares at Mar. 31, 2015 |  | 12,674 | 2,906 |  |  |  |
Balance at Dec. 31, 2015 | 626,998 | $ 1,269 | $ 291 | 304,884 | (567) | 321,121 |
Balance, Shares at Dec. 31, 2015 |  | 12,685 | 2,906 |  |  |  |
Net earnings | (8,932) |  |  |  |  | (8,932) |
Unrealized gain on short-term investments | 476 |  |  |  | 476 |  |
Changes in pension plan assets and benefit obligations | 1 |  |  |  | 1 |  |
Amortization of unearned stock-based compensation | 1,485 |  |  | 1,485 |  |  |
Issuance of non-voting common stock (upon vesting of restricted stock units) | 12 | $ 12 |  |  |  |  |
Issuance of voting common stock (upon vesting of restricted stock units), shares |  | 121 |  |  |  |  |
Cancellation of restricted non-voting stock units for tax withholdings on vested shares | (503) | $ (3) |  | (500) |  |  |
Cancellation of restricted voting stock units for tax withholdings on vested shares, shares |  | (27) |  |  |  |  |
Retirement of Treasury Stock, Shares |  | (8) |  |  |  |  |
Balance at Mar. 31, 2016 | $ 619,537 | $ 1,278 | $ 291 | $ 305,869 | $ (90) | $ 312,189 |
Balance, Shares at Mar. 31, 2016 |  | 12,771 | 2,906 |  |  |  |

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