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Consolidated Statement of Stockholders' Equity (USD $) In Thousands, except Share data | Total | Stockholders' Equity of the Company Preferred Stock [Member] | Stockholders' Equity of the Company Common Stock [Member] | Stockholders' Equity of the Company Treasury Stock [Member] | Stockholders' Equity of the Company Additional Paid-in Capital [Member] | Stockholders' Equity of the Company Accumulated Other Comprehensive Income [Member] | Stockholders' Equity of the Company Retained Earnings [Member] | Noncontrolling Interest [Member]
--- | --- | --- | --- | --- | --- | --- | --- | ---
Beginning balance,value at Dec. 31, 2012 | $ 500,337 | $ 0 | $ 522 | $ (428,716) | $ 350,714 | $ 22,981 | $ 540,791 | $ 14,045
Preferred stock beginning balance, share at Dec. 31, 2012 | 0 | 0 |  |  |  |  |  |
Common stock beginning balance, share at Dec. 31, 2012 | 52,288,567 |  | 52,288,000 |  |  |  |  |
Net income | 18,603 |  |  |  |  |  | 17,961 | 642
Dividends distributed to noncontrolling interest | (1,109) |  |  |  |  |  |  | (1,109)
Foreign currency translation adjustments | 3,134 |  |  |  |  | 3,224 |  | (90)
Derivatives valuation, net of tax | 2,180 |  |  |  |  | 2,180 |  |
Vesting of restricted stock units, share |  |  | 340,000 |  |  |  |  |
Vesting of restricted stock units, value | (3,959) |  | 3 | 4,851 | (8,813) |  |  |
Exercise of stock options, share |  |  | 59,000 |  |  |  |  |
Exercise of stock options, value | 539 |  | 1 | 844 | (306) |  |  |
Excess tax benefit from equity-based awards | 414 |  |  |  | 414 |  |  |
Equity-based compensation expense | 3,157 |  |  |  | 3,149 |  |  | 8
Purchases of common stock, share |  |  | (487,000) |  |  |  |  |
Purchases of common stock, value | (9,850) |  | (5) | (9,845) |  |  |  |
Other | 162 |  |  |  |  | 162 |  |
Ending balance,value at Mar. 31, 2013 | $ 513,608 | $ 0 | $ 521 | $ (432,866) | $ 345,158 | $ 28,547 | $ 558,752 | $ 13,496
Preferred stock ending balance, share at Mar. 31, 2013 | 0 | 0 |  |  |  |  |  |
Common stock ending balance, share at Mar. 31, 2013 | 52,200,947 |  | 52,200,000 |  |  |  |  |

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