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CONSOLIDATED STATEMENTS OF CHANGES IN EQUITY (USD $) In Thousands, except Share data | Total USD ($) | Common Stock [Member] | Additional paid-in capital [Member] USD ($) | Retained earnings [Member] USD ($) | Treasury stock [Member] USD ($) | Treasury stock reserved for deferred compensation [Member] USD ($) | Accumulated other comprehensive income (loss) [Member] USD ($) | Parent [Member] USD ($) | Noncontrolling interest [Member] USD ($)
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Balance, Beginning at Dec. 31, 2012 | $ 620,613 |  | $ 507,199 | $ 161,729 | $ (16,445) | $ (1,075) | $ (56,954) | $ 594,454 | $ 26,159
Balance, Beginning (in shares) at Dec. 31, 2012 |  | 48,562,204 |  |  |  |  |  |  |
Net income | 19,389 |  |  | 19,475 |  |  |  | 19,475 | (86)
Currency translation adjustment | 504 |  |  |  |  |  | 504 | 504 |
Pension liability adjustments, net of tax | 951 |  |  |  |  |  | 951 | 951 |
Unrealized loss on investments, net of tax | (3) |  |  |  |  |  | (3) | (3) |
Dividends on common stock | (268) |  |  | (268) |  |  |  | (268) |
Note conversion | (45,903) |  | (45,903) |  |  |  |  | (45,903) |
Note conversion (in shares) |  | 4,903,044 |  |  |  |  |  |  |
Exercise of stock options | 739 |  | 360 |  | 379 |  |  | 739 |
Exercise of stock options (in shares) |  | 42,253 |  |  |  |  |  |  |
Stock-based compensation | 963 |  | 963 |  |  |  |  | 963 |
Tax benefit related to stock-based compensation | (29) |  | (29) |  |  |  |  | (29) |
Issuance of treasury stock under 401(k) plan | 154 |  | 92 |  | 62 |  |  | 154 |
Issuance of treasury stock under 401(k) plan (in shares) |  | 6,930 |  |  |  |  |  |  |
Balance, Ending at Mar. 31, 2013 | $ 688,916 |  | $ 554,488 | $ 180,936 | $ (16,004) | $ (1,075) | $ (55,502) | $ 662,843 | $ 26,073
Balance, Ending (in shares) at Mar. 31, 2013 |  | 53,514,431 |  |  |  |  |  |  |

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