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CONSOLIDATED STATEMENTS OF CHANGES IN EQUITY (USD $) In Thousands, except Share data | Total | Common Stock [Member] | Additional paid-in capital [Member] | Retained earnings [Member] | Treasury stock [Member] | Treasury stock reserved for deferred compensation [Member] | Accumulated other comprehensive income (loss) [Member] | Parent [Member] | Noncontrolling interest [Member]
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Balance, Beginning at Dec. 31, 2011 | $ 396,879 | $ 37 | $ 380,295 | $ 67,053 | $ (17,338) | $ (1,233) | $ (33,575) | $ 395,239 | $ 1,640
Balance, Beginning (in shares) at Dec. 31, 2011 |  | 42,205,681 |  |  |  |  |  |  |
Net income | 79,719 |  |  | 79,475 |  |  |  | 79,475 | 244
Currency translation adjustment | (4,569) |  |  |  |  |  | (4,569) | (4,569) |
Pension liability adjustments, net of tax | 1,672 |  |  |  |  |  | 1,672 | 1,672 |
Unrealized gain on investments, net of tax | 337 |  |  |  |  |  | 337 | 337 |
Dividends on common stock | (423) |  |  | (423) |  |  |  | (423) |
Exercise of stock options | 887 |  | 269 |  | 618 |  |  | 887 |
Exercise of stock options (in shares) |  | 68,898 |  |  |  |  |  |  |
Consolidated joint venture | (84) |  |  |  |  |  |  |  | (84)
Stock-based compensation | 2,175 |  | 2,175 |  |  |  |  | 2,175 |
Tax benefit related to stock-based compensation | 190 |  | 190 |  |  |  |  | 190 |
Issuance of treasury stock under 401(k) plan | 293 |  | 173 |  | 120 |  |  | 293 |
Issuance of treasury stock under 401(k) plan (in shares) |  | 13,353 |  |  |  |  |  |  |
Balance, Ending at Jun. 30, 2012 | $ 477,076 | $ 37 | $ 383,102 | $ 146,105 | $ (16,600) | $ (1,233) | $ (36,135) | $ 475,276 | $ 1,800
Balance, Ending (in shares) at Jun. 30, 2012 |  | 42,287,932 |  |  |  |  |  |  |

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