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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 | 98,548 |  |  | 99,054 |  |  |  | 99,054 | (506)
Currency translation adjustment | (5,816) |  |  |  |  |  | (5,816) | (5,816) |
Pension liability adjustments, net of tax | 2,508 |  |  |  |  |  | 2,508 | 2,508 |
Unrealized loss on investments, net of tax | (16) |  |  |  |  |  | (16) | (16) |
Dividends on common stock | (634) |  |  | (634) |  |  |  | (634) |
Exercise of stock options | 925 |  | 285 |  | 640 |  |  | 925 |
Exercise of stock options (in shares) |  | 71,310 |  |  |  |  |  |  |
Acquisitions | 26,341 |  |  |  |  |  |  |  | 26,341
Consolidated joint venture | (84) |  |  |  |  |  |  |  | (84)
Stock-based compensation | 2,959 |  | 2,959 |  |  |  |  | 2,959 |
Tax benefit related to stock-based compensation | 185 |  | 185 |  |  |  |  | 185 |
Issuance of treasury stock under 401(k) plan | 453 |  | 274 |  | 179 |  |  | 453 |
Issuance of treasury stock under 401(k) plan (in shares) |  | 19,991 |  |  |  |  |  |  |
Balance, Ending at Sep. 30, 2012 | $ 522,248 | $ 37 | $ 383,998 | $ 165,473 | $ (16,519) | $ (1,233) | $ (36,899) | $ 494,857 | $ 27,391
Balance, Ending (in shares) at Sep. 30, 2012 |  | 42,296,982 |  |  |  |  |  |  |

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