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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 | 50,494 |  |  |  |  |  | 47,919 | 2,575
Dividends distributed to noncontrolling interest | (3,420) |  |  |  |  |  |  | (3,420)
Purchases of outstanding noncontrolling interest | (425) |  |  |  | 3,715 |  |  | (4,140)
Deconsolidation of a subsidiary | (121) |  |  |  |  |  |  | (121)
Foreign currency translation adjustments | (18,191) |  |  |  |  | (18,087) |  | (104)
Derivatives valuation, net of tax | (13,231) |  |  |  |  | (13,231) |  |
Vesting of restricted stock units, share |  |  | 400,000 |  |  |  |  |
Vesting of restricted stock units, value | (4,145) |  | 4 | 5,717 | (9,866) |  |  |
Exercise of stock options, share |  |  | 90,000 |  |  |  |  |
Exercise of stock options, value | 856 |  | 1 | 1,285 | (430) |  |  |
Excess tax benefit from equity-based awards | 644 |  |  |  | 644 |  |  |
Equity-based compensation expense | 9,749 |  |  |  | 9,724 |  |  | 25
Purchases of common stock, share |  |  | (2,281,000) |  |  |  |  |
Purchases of common stock, value | (51,627) |  | (23) | (51,604) |  |  |  |
Other | 451 |  |  |  |  | 451 |  |
Ending balance,value at Sep. 30, 2013 | $ 471,371 | $ 0 | $ 504 | $ (473,318) | $ 354,501 | $ (7,886) | $ 588,710 | $ 8,860
Preferred stock ending balance, share at Sep. 30, 2013 | 0 | 0 |  |  |  |  |  |
Common stock ending balance, share at Sep. 30, 2013 | 50,496,816 |  | 50,497,000 |  |  |  |  |

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