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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 | 35,394 |  |  | 35,419 |  |  |  | 35,419 | (25)
Currency translation adjustment | 3,567 |  |  |  |  |  | 3,567 | 3,567 |
Pension liability adjustments, net of tax | 836 |  |  |  |  |  | 836 | 836 |
Unrealized gain on investments, net of tax | 5,917 |  |  |  |  |  | 5,917 | 5,917 |
Dividends on common stock | (211) |  |  | (211) |  |  |  | (211) |
Exercise of stock options | 370 |  | 160 |  | 210 |  |  | 370 |
Exercise of stock options (in shares) |  | 23,490 |  |  |  |  |  |  |
Stock-based compensation | 791 |  | 791 |  |  |  |  | 791 |
Adjustments to Additional Paid in Capital, Income Tax Benefit from Share-based Compensation | 6 |  | 6 |  |  |  |  | 6 |
Issuance of treasury stock under 401(k) plan | 139 |  | 76 |  | 63 |  |  | 139 |
Issuance of treasury stock under 401(k) plan (in shares) |  | 6,998 |  |  |  |  |  |  |
Balance, Ending at Mar. 31, 2012 | $ 443,688 | $ 37 | $ 381,328 | $ 102,261 | $ (17,065) | $ (1,233) | $ (23,255) | $ 442,073 | $ 1,615
Balance, Ending (in shares) at Mar. 31, 2012 |  | 42,236,169 |  |  |  |  |  |  |

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