v3.6.0.2

Consolidated Statements of Shareholders' Equity - 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]
--- | --- | --- | --- | --- | --- | ---
Balance at Dec. 31, 2013 | $ 559,965 | $ 1,257 | $ 291 | $ 296,932 | $ (24) | $ 261,509
Balance, Shares at Dec. 31, 2013 |  | 12,568 | 2,906 |  |  |
Net earnings (loss) | 32,688 |  |  |  |  | 32,688
Unrealized gain (loss) on short-term investments | (173) |  |  |  | (173) |
Changes in pension plan assets and benefit obligations | 10 |  |  |  | 10 |
Amortization of unearned stock-based compensation | 4,753 |  |  | 4,753 |  |
Issuance of non-voting common stock (upon vesting of restricted stock units) | 1 | $ 1 |  |  |  |
Issuance of non-voting common stock (upon vesting of restricted stock units), shares |  | 12 |  |  |  |
Cancellation of restricted non-voting stock units for tax withholdings on vested shares | (178) |  |  | (178) |  |
Cancellation of restricted non-voting stock units for tax withholdings on vested shares, shares |  | (4) |  |  |  |
Other | 2 |  |  | 26 | (24) |
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 (loss) | 26,924 |  |  |  |  | 26,924
Unrealized gain (loss) on short-term investments | (384) |  |  |  | (384) |
Changes in pension plan assets and benefit obligations | 4 |  |  |  | 4 |
Amortization of unearned stock-based compensation | 5,799 |  |  | 5,799 |  |
Issuance of non-voting common stock (upon vesting of restricted stock units) | 18 | $ 18 |  |  |  |
Issuance of non-voting common stock (upon vesting of restricted stock units), shares |  | 179 |  |  |  |
Cancellation of restricted non-voting stock units for tax withholdings on vested shares | (2,203) | $ (7) |  | (2,196) |  |
Cancellation of restricted non-voting stock units for tax withholdings on vested shares, shares |  | (70) |  |  |  |
Purchase and retirement of treasury stock | (252) |  |  | (252) |  |
Other | 24 |  |  |  | 24 |
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 (loss) | (26,680) |  |  |  |  | $ (26,680)
Unrealized gain (loss) on short-term investments | 113 |  |  |  | 113 |
Changes in pension plan assets and benefit obligations | (24) |  |  |  | $ (24) |
Amortization of unearned stock-based compensation | 4,819 |  |  | 4,819 |  |
Issuance of non-voting common stock (upon vesting of restricted stock units) | 12 | $ 12 |  |  |  |
Issuance of non-voting common stock (upon vesting of restricted stock units), shares |  | 130 |  |  |  |
Cancellation of restricted non-voting stock units for tax withholdings on vested shares | (531) | $ (3) |  | (528) |  |
Cancellation of restricted non-voting stock units for tax withholdings on vested shares, shares |  | (28) |  |  |  |
Cancellation of restricted non-voting stock units (performance not met) | $ (4,929) |  |  | $ (4,929) |  |
Cancellation of restricted non-voting stock units (performance not met), shares | 0 | 0 | 0 | 0 | 0 | 0
Retirement of treasury stock, shares |  | (8) |  |  |  |
Balance at Dec. 31, 2016 | $ 599,778 | $ 1,278 | $ 291 | $ 304,246 | $ (478) | $ 294,441
Balance, Shares at Dec. 31, 2016 |  | 12,779 | 2,906 |  |  |

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