v3.5.0.2

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 | 16,817 |  |  |  |  | 16,817 |
Unrealized gain (loss) on short-term investments | (10) |  |  |  | (10) |  |
Amortization of unearned stock-based compensation | 3,359 |  |  | 3,359 |  |  |
Issuance of non-voting common stock (upon vesting of restricted stock units) | 17 | $ 17 |  |  |  |  |
Issuance of non-voting common stock (upon vesting of restricted stock units), shares |  | 166 |  |  |  |  |
Cancellation of restricted non-voting stock units for tax withholdings on vested shares | (2,103) | $ (7) |  | (2,096) |  |  |
Cancellation of restricted non-voting stock units for tax withholdings on vested shares, shares |  | (66) |  |  |  |  |
Purchase of treasury stock | (252) |  |  |  |  |  | $ (252)
Other | 24 |  |  |  | 24 |  |
Balance at Jun. 30, 2015 | 614,920 | $ 1,268 | $ 291 | 302,796 | (197) | 311,014 | $ (252)
Balance, Shares at Jun. 30, 2015 |  | 12,676 | 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 | (4,655) |  |  |  |  | (4,655) |
Unrealized gain (loss) on short-term investments | 611 |  |  |  | 611 |  |
Changes in pension plan assets and benefit obligations | 1 |  |  |  | 1 |  |
Amortization of unearned stock-based compensation | 2,882 |  |  | 2,882 |  |  |
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 Jun. 30, 2016 | $ 625,346 | $ 1,278 | $ 291 | $ 307,266 | $ 45 | $ 316,466 |
Balance, Shares at Jun. 30, 2016 |  | 12,771 | 2,906 |  |  |  |

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